Prof. Dr. Erdem Koçak

Erdem L, Koçak E. Re: A New Risk-Scoring System for Colorectal Cancer and Polyp Screening. Turk J Gastroenterol. 2022 Dec;33(12):1080-10080. doi: 10.5152/tjg.2022.224312. PMID: 36892049.

Türker F, Sahın T, Oral A, Koçak E, Çavuşoğlu Türker B, Niğdelioğlu A, Esra Ataoğlu H. Evaluation of Predisposing Metabolic Risk Factors for Portopulmonary Hypertension in Patients with NASH Cirrhosis. Int J Gen Med. 2022 Jan 25;15:859-865. doi: 10.2147/IJGM.S339474. eCollection 2022. PMID: 35115812.

Koyuncu Sokmen B, Sahin T, Oral A, Kocak E, Inan N. The comparison of pancreatic and hepatic steatosis in healthy liver donor candidates. Sci Rep. 2021 Feb 24;11(1):4507. doi: 10.1038/s41598-021-83871-0. PMID: 33627704.

Sahin T, Oral A, Turker F, Kocak E. Can hypothyroidism be a protective factor for hepatocellular carcinoma in cirrhosis? Medicine (Baltimore). 2020 Mar;99(11):e19492. doi: 10.1097/MD.0000000000019492. PMID: 32176089.

Erdem L, Akbal E, Koçak E, Tucer D, Üçbilek E, Uyanıkoğlu A, Dolapçıoğlu C, Ahısalı Erim E, Şirin G, Alkım H, Soylu A, Doğanay L, Kürbüz AK, Özdil K, Alagözlü H, Erürker Öztürk T, Sezikli M, Adalı G, Çoban M, Hülagü S, Değertekin H, Atasoy A, Akyüz F, Gaffarlı İ, Saruç M, Altıntaş E, Sezgin O, Tözün N. A New Risk-Scoring System for Colorectal Cancer and Polyp Screening by Turkish Colorectal Cancer and Polyp Study Group. Turk J Gastroenterol. 2022 Apr;33(4):286-293. doi: 10.5152/tjg.2022.21072. PMID: 35550537.

Koçak E, Akbal E, Beyazit Y, Ergül B, Karataş A, Köklü S, Ekşioğlu HM. Celiac disease prevalence in a large series of patients with Behçet's disease. Int J Rheum Dis. 2018 Dec;21(12):2146-2150. doi: 10.1111/1756-185X.12990. Epub 2017 Apr 11. PMID: 28397343.

Çavuşoğlu Türker B, Ahbab S, Türker F, Hoca E, Çiftçi Öztürk E, Kula AC, Öztürk H, Urvasızoğlu AÖ, Kalaycı N, Koçak E, Bulut M, Yasun Ö, Ataoğlu HE. Comparison of Controlling Nutritional Status Score with Bedside Index for Severity in Acute Pancreatitis Score and Atlanta Classification for Mortality in Patients with Acute Pancreatitis. J Clin Med. 2024 Jun 11;13(12):3416. doi: 10.3390/jcm13123416. PMID: 38929944.

Türker F, Oral A, Şahin T, Türker BÇ, Koçak E, Ataoğlu HE, Ahbab S. Does the FT3-to-FT4 ratio easily predict the progression of NAFLD and NASH cirrhosis? J Int Med Res. 2021 Nov;49(11):3000605211056841. doi: 10.1177/03000605211056841. PMID: 34763561.

Akbal E, Batgi H, Koçak E, Canatan T, Köklü S. Low-dose amiodarone-induced fatal liver failure. Drug Chem Toxicol. 2013 Apr;36(2):261-2. doi: 10.3109/01480545.2011.653489. Epub 2012 Feb 23. PMID: 22356138.

Akbal E, Koçak E, Köklü S, Ergül B, Akyürek Ö, Yılmaz FM. Serum Toll-Like Receptor-2, Toll-Like Receptor-4 Levels in Patients with HBeAg-Negative Chronic Viral Hepatitis B. Viral Immunol. 2017 May;30(4):278-282. doi: 10.1089/vim.2016.0131. Epub 2017 Apr 17. PMID: 28414577.

Adam G, Tas S, Cinar C, Bozkaya H, Adam F, Uysal F, Resorlu M, Unalp OV, Parildar M, Koçak E, Ozdemir H. Endovascular treatment of delayed hemorrhage developing after the pancreaticoduodenectomy procedure. Wien Klin Wochenschr. 2014 Jul;126(13-14):416-21. doi: 10.1007/s00508-014-0557-x. Epub 2014 May 28. PMID: 24865770.

Köklü S, Koçak E, Erel S, Dinç S. Crohn's disease presenting with multiple intestinal "perforation". J Crohns Colitis. 2010 Jun;4(2):217-8. doi: 10.1016/j.crohns.2009.11.003. Epub 2009 Dec 1. PMID: 21122511.

Akbal E, Koçak E, Akyürek Ö, Köklü S, Batgi H, Şenes M. Liver fatty acid-binding protein as a diagnostic marker for non-alcoholic fatty liver disease. Wien Klin Wochenschr. 2016 Jan;128(1-2):48-52. doi: 10.1007/s00508-014-0680-8. Epub 2014 Dec 2. PMID: 25447969.

Oral A, Sahin T, Turker F, Kocak E. Relationship Between Serum Uric Acid Levels and Nonalcoholic Fatty Liver Disease in Non-Obese Patients. Medicina (Kaunas). 2019 Sep 17;55(9):600. doi: 10.3390/medicina55090600. PMID: 31533345.

Can M, Açikgöz Ş, Mungan G, Bayraktaroğlu T, Koçak E, Güven B, Demirtas S. Serum cardiovascular risk factors in obstructive sleep apnea. Chest. 2006 Feb;129(2):233-237. doi: 10.1378/chest.129.2.233. PMID: 16478836.

Köklü S, Alioğlu B, Akbal E, Koçak E. Celiac disease in siblings with Pearson syndrome. Am J Med Sci. 2010 Apr;339(4):392-4. doi: 10.1097/MAJ.0b013e3181cefba3. PMID: 20228667.

Koçak E, Köklü S, Başar O, Yilmaz FM, Ciftçi A, Kaya C, Cesur S, Demirci S, Akbal E, Taş A. Evaluation of serum TWEAK concentration in patients with acute pancreatitis. Scand J Clin Lab Invest. 2012 May;72(3):192-6. doi: 10.3109/00365513.2011.629678. Epub 2012 Feb 22. PMID: 22356682.

Akbal E, Demirci S, Koçak E, Köklü S, Başar O, Tuna Y. Alterations of platelet function and coagulation parameters during acute pancreatitis. Blood Coagul Fibrinolysis. 2013 Apr;24(3):243-6. doi: 10.1097/MBC.0b013e32835aef51. PMID: 23425662.

Demirci S, Akbal E, Koçak E, Taş A, Köklü S. Adipokine levels in the course of mild biliary pancreatitis. Ann Nutr Metab. 2012;61(4):271-4. doi: 10.1159/000336288. Epub 2012 Dec 3. PMID: 23208155.

Akbal E, Köklü S, Astarcı HM, Koçak E, Karaca G, Beyazıt Y, Topcu G, Acar B, Ergün D, Haznedaroğlu İC. Oral high-dose ankaferd administration effects on gastrointestinal system. Int J Med Sci. 2013;10(4):451-6. doi: 10.7150/ijms.4875. Epub 2013 Mar 2. PMID: 23471574.

Batgi H, Akbal E, Koçak E, Akyürek Ö, Köklü S, Dönmez M, Güneş F. Treatment of hemorrhagic gastritis by Ankaferd blood stopper versus Omeprazole: experimental randomized rat models. Wien Klin Wochenschr. 2016 Dec;128(Suppl 8):559-565. doi: 10.1007/s00508-015-0762-2. Epub 2015 Apr 10. PMID: 25860852.

Koçak E, Köklü S, Akbal E, Taş A, Karaca G, Astarcı MH, Güven B, Can M. NaOH-induced Crohn's colitis in rats: a novel experimental model. Dig Dis Sci. 2011 Oct;56(10):2833-7. doi: 10.1007/s10620-011-1697-8. Epub 2011 Apr 19. PMID: 21503680.

Oral A, Sahin T, Turker F, Kocak E. Evaluation of Plateletcrit and Platelet Distribution Width in Patients with Non-Alcoholic Fatty Liver Disease: A Retrospective Chart Review Study. Med Sci Monit. 2019 Dec 23;25:9882-9886. doi: 10.12659/MSM.920172. PMID: 31868169.

Ozkan H, Erdal H, Koçak E, Tutkak H, Karaeren Z, Yakut M, Köklü S. Diagnostic and prognostic role of serum glypican 3 in patients with hepatocellular carcinoma. J Clin Lab Anal. 2011;25(5):350-3. doi: 10.1002/jcla.20484. PMID: 21919070.

Akbal E, Koçak E, Taş A, Yüksel E, Köklü S. Visfatin levels in nonalcoholic fatty liver disease. J Clin Lab Anal. 2012 Feb;26(2):115-9. doi: 10.1002/jcla.21491. PMID: 22467327.

Tas A, Akbal E, Beyazit Y, Kocak E. Serum lactate level predict mortality in elderly patients with cirrhosis. Wien Klin Wochenschr. 2012 Aug;124(15-16):520-5. doi: 10.1007/s00508-012-0208-z. Epub 2012 Jul 19. PMID: 22810366.

Koçak E, Akbal E, Taş A, Köklü S, Karaca G, Can M, Kösem B, Üstün H. Anti-inflammatory efficiency of Ankaferd blood stopper in experimental distal colitis model. Saudi J Gastroenterol. 2013 May-Jun;19(3):126-30. doi: 10.4103/1319-3767.111955. PMID: 23680710.

Azak A, Koçak G, Huddam B, Koçak E, Ergül B, Duranay M. Focal segmental glomerulosclerosis associated with primary biliary cirrhosis. Ren Fail. 2011;33(10):1052-3. doi: 10.3109/0886022X.2011.618971. PMID: 22013944.

Tas A, Köklü S, Kocak E, Akbal E, Ergul B. An unusual cause of acute pancreatitis: annular pancreas and papillary opening of the cystic duct. Gut Liver. 2012 Jul;6(3):403-4. doi: 10.5009/gnl.2012.6.3.403. Epub 2012 Jul 12. PMID: 22844573.

Başar O, Akbal E, Köklü S, Koçak E, Tuna Y, Ekiz F, Gültuna S, Yιlmaz FM, Aydoğan T. A novel appetite peptide, nesfatin-1 in patients with non-alcoholic fatty liver disease. Scand J Clin Lab Invest. 2012 Oct;72(6):479-83. doi: 10.3109/00365513.2012.699097. Epub 2012 Sep 5. PMID: 22950627.

Tuna Y, Koçak E, Dinçer D, Köklü S. Factors affecting the success of endoscopic bougia dilatation of radiation-induced esophageal stricture. Dig Dis Sci. 2012 Feb;57(2):424-8. doi: 10.1007/s10620-011-1875-8. Epub 2011 Aug 31. PMID: 21879280.

Koçak E, Akbal E, Köklü S, Adam G. Evaluation of serum L-FABP levels in patients with acute pancreatitis. Ulus Travma Acil Cerrahi Derg. 2015 Jan;21(1):39-43. doi: 10.5505/tjtes.2015.49879. PMID: 25779711.

Ergül B, Filik L, Koçak E, Dogan Z, Sarikaya M. Response to 'Letter to editor'. Saudi J Gastroenterol. 2015 Jan-Feb;21(1):57. doi: 10.4103/1319-3767.151235. PMID: 25672243.

Pirti O, Koçak E, Güler O, Koçak G, Altunkaya C, Caydere M, Köklü S. An unusual cause of unilateral hydronephrosis: invasive colonic amebiasis. Ren Fail. 2012;34(6):798-800. doi: 10.3109/0886022X.2012.673467. Epub 2012 Apr 10. PMID: 22486169.

Ergül B, Koçak E, Köklü S. Behcet disease and celiac disease: to screen or not? Rheumatol Int. 2012 Aug;32(8):2591-2. doi: 10.1007/s00296-011-2132-3. Epub 2011 Sep 1. PMID: 21881981.

Taş A, Koklu S, Beyazit Y, Akbal E, Kocak E, Celik H, Bıyıkoğlu I. The endoscopic course of scattered white spots in the descending duodenum: a prospective study. Gastroenterol Hepatol. 2012 Feb;35(2):57-64. doi: 10.1016/j.gastrohep.2011.11.010. Epub 2012 Jan 20. PMID: 22260755.

Ekiz F, Yüksel O, Koçak E, Yılmaz B, Altınbaş A, Çoban S, Yüksel I, Üsküdar O, Köklü S. Mean platelet volume as a fibrosis marker in patients with chronic hepatitis B. J Clin Lab Anal. 2011;25(3):162-5. doi: 10.1002/jcla.20450. PMID: 21567462.

Ozkan OF, Akbal E, Goret CC, Goret NE, Ozturk A, Cıkman O, Koçak E. Intraoperative Endoscopic Retrograde Cholangiopancreatography in patients with complex benign biliary tract pathologies A case series. Ann Ital Chir. 2018;89:413-418. PMID: 30246701.

Ergül B, Koçak E, Taş A, Filik L, Köklü S. Bismuth, moxifloxacin, tetracycline, lansoprazole quadruple first line therapy for eradication of H. pylori: A prospective study. Clin Res Hepatol Gastroenterol. 2013 Nov;37(5):527-9. doi: 10.1016/j.clinre.2012.10.014. Epub 2013 Jan 9. PMID: 23312494.

Kocak G, Kocak E, Yilmaz SR, Koklu S, Duranay M, Yalcin F, Albayrak Y. MEFV gene mutations in a patient with eosinophilic gastroenteritis. South Med J. 2010 Nov;103(11):1170-2. doi: 10.1097/SMJ.0b013e3181f468b4. PMID: 20890251.

Akbal E, Köklü S, Koçak E, Cakal B, Güneş F, Başar O, Tuna Y, Senes M. Liver fatty acid-binding protein is a diagnostic marker to detect liver injury due to chronic hepatitis C infection. Arch Med Res. 2013 Jan;44(1):34-8. doi: 10.1016/j.arcmed.2012.11.007. Epub 2013 Jan 3. PMID: 23291381.

Yüksel E, Akbal E, Koçak E, Akyürek Ö, Köklü S, Ekiz F, Yılmaz B. The relationship between visfatin, liver inflammation, and acute phase reactants in chronic viral hepatitis B. Wien Klin Wochenschr. 2016 Sep;128(17-18):658-62. doi: 10.1007/s00508-015-0723-9. Epub 2015 Apr 9. PMID: 25854905.

Beyazit Y, Sayilir A, Tanoglu A, Kekilli M, Kocak E, Ekiz F, Tas A. Plasma Thrombin-activatable Fibrinolysis Inhibitor Levels Correlate with the Disease Activity of Ulcerative Colitis. Intern Med. 2016;55(14):1831-6. doi: 10.2169/internalmedicine.55.6473. Epub 2016 Jul 15. PMID: 27432089.

Taş A, Köklü S, Beyazit Y, Karaca G, Astarcı HM, Akbal E, Koçak E, Topçu G, Haznedaroglu IC. Percutaneous ankaferd injection to in vivo liver tissue in comparison to ethanol in an experimental rat model. Clin Res Hepatol Gastroenterol. 2011 Sep;35(8-9):549-53. doi: 10.1016/j.clinre.2011.02.013. Epub 2011 Apr 12. PMID: 21489900.

Coban Ş, Akbal E, Köklü S, Köklü G, Ulaşlı MA, Erkeç S, Aktaş B, Yüksel O, Koçak E, Erdem HR. Clinical trial: transcutaneous interferential electrical stimulation in individuals with irritable bowel syndrome - a prospective double-blind randomized study. Digestion. 2012;86(2):86-93. doi: 10.1159/000338301. Epub 2012 Jul 27. PMID: 22846190.

Köklü S, Koçak E, Akbal E. Air cholangiography for severe hilar obstruction at ERCP. Gastrointest Endosc. 2011 Jun;73(6):1326. doi: 10.1016/j.gie.2010.12.038. PMID: 21628021.

Koçak E, Tuna Y, Ertugrul I, Arhan M, Köklü S. Metastasis of hepatocellular carcinoma into the right atrium. Clin J Oncol Nurs. 2011 Jun;15(3):243-4. doi: 10.1188/11.CJON.243-244. PMID: 21624858.

Akbal E, Koçak E, Taş A, Köklü S. Phlebotomy in the treatment of primary biliary cirrhosis. Scand J Gastroenterol. 2011 Jan;46(1):124-5. doi: 10.3109/00365521.2010.522724. Epub 2010 Oct 6. PMID: 20923381.

Kaya G, Koçak E, Akbal E, Taş A, Köklü S. Comparison of the possible risk factors of bone mineral density in subjects with ulcerative colitis and healthy subjects. South Med J. 2011 Nov;104(11):747-51. doi: 10.1097/SMJ.0b013e318232367e. PMID: 22024784.

Samsar U, Ustündağ Y, Aydemir S, Ozer Tekin I, Koçak E. Helicobacter pylori seropositivity in patients with reflux esophagitis. Turk J Gastroenterol. 2003 Dec;14(4):282-3. PMID: 15048608.

Taş A, Akbal E, Koçak E, Köklü S, Yilmaz O, Turan A. Abdominal pain due to rectus abdominis muscle haematoma associated with anticoagulant therapy. Emerg Med Australas. 2010 Jun;22(3):252-3. doi: 10.1111/j.1742-6723.2010.01294.x. PMID: 20590789.

Köklü S, Koçak E, Tas A, Biyikoğlu I, Ustün H. Metastatic polyps in the hepatic flexura of the colon. Clin J Oncol Nurs. 2010 Dec;14(6):683-4. doi: 10.1188/10.CJON.683-684. PMID: 21112845.

Koçak G, Koçak E, Akbal E, Şen H, Erbağ G, Erdoğan C. Eosinophilic colitis: a rare cause of lower gastrointestinal bleeding in an elderly adult. J Am Geriatr Soc. 2014 Oct;62(10):2016-7. doi: 10.1111/jgs.13043. PMID: 25333555.

Ergül B, Koçak E, Köklü S. Arthritis as a presenting symptom of subclinical Crohn's disease. J Crohns Colitis. 2012 Jun;6(5):634-5. doi: 10.1016/j.crohns.2012.02.001. Epub 2012 Mar 11. PMID: 22410347.

Ergül B, Koçak E, Akbal E, Köklü S, Astarci HM. Pegylated interferon associated lichen planus at the injection site. Acta Gastroenterol Belg. 2011 Dec;74(4):591-2. PMID: 22319976.

Voyvoda N, Koçak E, Arslan E. An unusual cause of right sided hip pain in a patient with ulcerative colitis: iliopsoas muscle atrophia. J Crohns Colitis. 2011 Apr;5(2):167-8. doi: 10.1016/j.crohns.2010.12.008. Epub 2011 Feb 18. PMID: 21453889.

Ustündağ Y, Aydemir S, Koçak E. A simple modification of jejunal tube placement through the PEG catheter to facilitate the procedure. Turk J Gastroenterol. 2006 Mar;17(1):76-7. PMID: 16830285.

Akbal E, Koçak E, Köklü S. Mesalamine (pentasa)-induced painful skin lesions. Inflamm Bowel Dis. 2010 May;16(5):725-6. doi: 10.1002/ibd.21087. PMID: 19714758.

Ergül B, Filik L, Koçak E, Doğan Z, Sarıkaya M. Efficacy and safety of gum chewing in adjunct to high-dose senna for bowel cleansing before colonoscopy: a single-blind randomized controlled trial. Saudi J Gastroenterol. 2014 Nov-Dec;20(6):356-9. doi: 10.4103/1319-3767.145325. PMID: 25434316.

Beyazit Y, Kocak E, Tanoglu A, Kekilli M. Oxidative stress might play a role in low serum vitamin D associated liver fibrosis among patients with autoimmune hepatitis. Dig Dis Sci. 2015 Apr;60(4):1106-8. doi: 10.1007/s10620-015-3526-y. Epub 2015 Jan 14. PMID: 25586086.

Taş A, Akbal E, Koçak E, Köklü S. Moxifloxacin-tetracycline-lansoprazole triple therapy for first-line treatment of Helicobacter pylori infection: a prospective study. Helicobacter. 2011 Feb;16(1):52-4. doi: 10.1111/j.1523-5378.2010.00817.x. PMID: 21241413.

Koçak E, Akbal E, Köklü S, Ergül B, Can M. The Colonic Tissue Levels of TLR2, TLR4 and Nitric Oxide in Patients with Irritable Bowel Syndrome. Intern Med. 2016;55(9):1043-8. doi: 10.2169/internalmedicine.55.5716. Epub 2016 May 1. PMID: 27150852.

Sayarlioglu H, Erkoc R, Dogan E, Topal C, Algun E, Erem C, Atmaca H, Kocak E, Yilmaz R, Erdol H, Cinal A. Nephropathy and retinopathy in type 2 diabetic patients living at moderately high altitude and sea level. Ren Fail. 2005;27(1):67-71. PMID: 15717637.

Koçak E, Köklü S, Yildiz M, Basaran M. Gastric stromal tumor: a rare cause of anemia in older adults. J Am Geriatr Soc. 2010 Jan;58(1):206-7. doi: 10.1111/j.1532-5415.2009.02647.x. PMID: 20122073.

Karaca G, Koçak E, Pekici R, Güler O, Köklü S. A rare cause of acute appendicitis: cystic lymphangioma. Am Surg. 2010 Sep;76(9):E150-1. PMID: 21396267.

Koçak E, Kılıç F, Akbal E, Taş A, Köklü S, Filik L, Bıyıkoğlu I, Ergül B. The usefulness of ulcer size and location in the differential diagnosis of benign and malignant gastric ulcer. Wien Klin Wochenschr. 2013 Jan;125(1-2):21-5. doi: 10.1007/s00508-012-0309-8. Epub 2013 Jan 5. PMID: 23292642.

Koçak G, Koçak E, Azak A, Unverdi H. An unusual cause of acute renal failure in a patient with surgical hypoparathyroidism: nephrocalcinosis. Endocrine. 2012 Feb;41(1):162-3. doi: 10.1007/s12020-011-9561-3. PMID: 22083502.

Buluş H, Akkoca M, Coskun A, Koçak E, Köklü S. Benign ovarian cyst presenting as a huge intraabdominal mass in an elderly postmenopausal woman. J Am Geriatr Soc. 2012 Jun;60(6):1170-2. doi: 10.1111/j.1532-5415.2012.03972.x. PMID: 22690987.

Koçak E, Ergül B, Köklü S, Dinç S, Ozbalcı GS. Abundant intraperitoneal bleeding after colonoscopy. Clin Res Hepatol Gastroenterol. 2011 Sep;35(8-9):599-600. doi: 10.1016/j.clinre.2011.05.004. Epub 2011 Jun 11. PMID: 21659014.

Unverdi S, Ceri M, Öztürk MA, Akbal E, Ensari A, Yılmaz R, Kocak E, Inal S, Koklu S, Duranay M. A patient with Crohn's disease who presented with thrombotic thrombocytopenic purpura/hemolytic uremic syndrome. Ren Fail. 2011;33(2):244-5. doi: 10.3109/0886022X.2010.541577. PMID: 21332348.

Koçak E, Beyazıt Y. Blood hemoglobin values are a strong predictor of serum adiponectin levels. Turk J Gastroenterol. 2015 Jul;26(4):356. doi: 10.5152/tjg.2015.0061. Epub 2015 Jun 2. PMID: 26039007.

Unverdi S, Ceri M, Köklü S, Unverdi H, Koçak E, Duranay M. Tenofovir as a first line option for prophylaxis in a patient with hepatitis B virus associated nephrotic syndrome. Ann Hepatol. 2011 Jul-Sep;10(3):372-3. PMID: 21677344.

Beyazıt Y, Koçak E, Tanoğlu A. Serum total antioxidant capacity to discriminate benign from malignant causes of biliary obstruction. Turk J Gastroenterol. 2014 Oct;25(5):592-3. doi: 10.5152/tjg.2014.14031. PMID: 25417631.

Oral A, Çavuşoğlu Türker B, Anılır E, Şahin T, Koçak E, Türker F. Association of Euthyroid Thyroid Hormone Levels with Hepatic Steatosis in Patients with Nonalcoholic Fatty Liver Disease. Diabetes Metab Syndr Obes. 2026 May 23;19:555563. doi: 10.2147/DMSO.S555563. eCollection 2026. PMID: 42221147.

Adam G, Güneş F, Akbal E, Cinar C, Bozkaya H, Resorlu M, Aylanç N, Koçak E. An unusual case of ectopic variceal bleeding treated with percutaneous intervention. Acta Gastroenterol Belg. 2014 Jun;77(2):270-1. PMID: 25090830.

Sarikaya M, Koçak E, Köklü S, Akbal E. Acute gastric obstruction resulting from gallstone-induced bezoar. Am Surg. 2012 Dec;78(12):E529. PMID: 23265111.

Adam G, Kocak E, Özkan A, Reşorlu M, Çınar C, Bozkaya H, Kurt T, Altun B, Şen HM, Akbal A, Bozkurt N, Saçar M. Evaluation of platelet distribution width and mean platelet volume in patients with carotid artery stenosis. Angiology. 2015 Apr;66(4):375-8. doi: 10.1177/0003319714548682. Epub 2014 Oct 13. PMID: 25313243.

Bulus H, Yildiz M, Alimogullari M, Simşek G, Köklü S, Koçak E. Gastric heterotopia within the gallbladder wall in a patient with chronic cholecystitis. Am Surg. 2012 Jan;78(1):E51-2. PMID: 22273312.

Koçak E, Köklü S, Akbal E, Huddam B, Azak A, Yilmaz SR. Development of glomerulonephritis early in the course of Crohn's disease. Inflamm Bowel Dis. 2010 Apr;16(4):548-9. doi: 10.1002/ibd.21044. PMID: 19637383.

Koçak G, Koçak E, Huddam B, Azak A, Voyvoda N, Bulut M, Duranay M. Successful surgical treatment of massive lower gastrointestinal bleeding in a patient with Wegener's granulomatosis. Am Surg. 2012 Sep;78(9):E416-7. PMID: 22964183.

Koçak E, Ergül B, Köklü S, Akbal E. Ectopıc spleen presentıng as an abdomınal mass ın a patıent wıth Crohn's dısease. J Crohns Colitis. 2012 Apr;6(3):394-5. doi: 10.1016/j.crohns.2011.12.012. Epub 2012 Jan 5. PMID: 22405183.

Tuna Y, Koçak E, Köklü S, Yüksel I. An unusual cause of chronic diarrhea in a patient with chronic lymphocytic leukemia. South Med J. 2010 May;103(5):487-8. doi: 10.1097/SMJ.0b013e3181d82d67. PMID: 20375934.

Akbal E, Köklü S, Koçak E, Cakal B, Kılıç F. 5-aminosalicylic acid induced multisystem disorders in the course of Crohn' s disease. J Crohns Colitis. 2010 Sep;4(3):345-6. doi: 10.1016/j.crohns.2010.01.006. Epub 2010 Feb 19. PMID: 21122525.

Köklü S, Akkuş MA, Taş A, Tufan Z, Tanrikulu Y, Kekilli M, Koçak E, Gönültaş MA, Yimaz Ö. Recurrent pyogenic cholangitis in a case with congenital biliary anomaly. Ann Hepatol. 2012 Mar-Apr;11(2):268-71. PMID: 22345347.

Taş A, Ozer E, Köklü S, Kocak E. Signet ring cell carcinoma of the ampulla of vater: a rare cause of acute pancreatitis. Scand J Gastroenterol. 2011 Jan;46(1):126-7. doi: 10.3109/00365521.2010.525257. Epub 2010 Oct 18. PMID: 20950208.

Voyvoda NK, Koçak G, Koçak E, Voyvoda B. An unusual cause of chronic lower back pain in an elderly woman: lost intrauterine device. South Med J. 2011 Jan;104(1):71. doi: 10.1097/SMJ.0b013e318200d00d. PMID: 21119551.

Bulus H, Koçak E, Yavuz A, Akkoca M, coşkun A, Köklü S. Intestinal perforation as the initial presentation of Wegener's granulomatosis. Rheumatol Int. 2013 Nov;33(11):2957-8. doi: 10.1007/s00296-012-2517-y. Epub 2012 Sep 7. PMID: 22955877.

Koçak E, Köklü S, Akbal E. Extreme high serum level of carbohydrate antigen 19-9 in a patient with a single biliary stone. Am Surg. 2010 Dec;76(12):1429-30. PMID: 21265364.

Taş A, Koçak E, Akbal E, Köklü S. Treatment of glomerulonephritis associated with hepatitis C virus in patient with cirrhosis: only pegylated interferon and ribavirin. Chin Med J (Engl). 2011 May;124(10):1600. PMID: 21740828.

Adam G, Kocak E, Reşorlu M. Evaluation of platelet distribution width and mean platelet volume in patients with carotid artery stenosis: author's reply. Angiology. 2015 Apr;66(4):380. doi: 10.1177/0003319714565169. Epub 2014 Dec 30. PMID: 25550451.

Cakal B, Akbal E, Köklü S, Babalı A, Koçak E, Taş A. Acute therapy with intravenous omeprazole on caustic esophageal injury: a prospective case series. Dis Esophagus. 2013 Jan;26(1):22-6. doi: 10.1111/j.1442-2050.2011.01319.x. Epub 2012 Feb 14. PMID: 22332893.

Tuna Y, Koçak E, Köklü S. Common variable immunodeficiency associated with Crohn's disease. Acta Clin Belg. 2011 Jan-Feb;66(1):75-6. doi: 10.2143/ACB.66.1.2062524. PMID: 21485773.

Kocak E, Ozer E, Filik L. Differential diagnosis of inflammatory bowel diseases in psoriasis. Acta Clin Belg. 2010 May-Jun;65(3):208-9. doi: 10.1179/acb.2010.047. PMID: 20669793.

Koçak G, Koçak E, Akbal E, Duranay M, Köklü S. A rare cause of severe hypoalbuminemia in a patient with primary hypoparathyroidism: intestinal lymphangiectasia. Acta Clin Belg. 2011 May-Jun;66(3):246-7. doi: 10.2143/ACB.66.3.2062563. PMID: 21837942.

Yildirim AC, Koçak E, Yildiz P, Yildiz M, Karakayali AŞ, Kaptanoglu B, Köklü S. Multiple intestinal perforation in a patient with Wegener's granulomatosis: a case report and review of the literature. Gastroenterol Clin Biol. 2010 Dec;34(12):712-5. doi: 10.1016/j.gcb.2010.08.009. Epub 2010 Sep 29. PMID: 20884146.

Azak A, Huddam B, Koçak G, Kiliç F, Koçak E, Duranay M. Takayasu arteritis and ulcerative colitis; coexistence or misdiagnosis? Sarcoidosis Vasc Diffuse Lung Dis. 2012 Mar;29(1):53-4. PMID: 23311124.

Akbal E, Köklü S, Karaca G, Astarci HM, Koçak E, Taş A, Beyazit Y, Topcu G, Haznedaroğlu IC. Beneficial effects of Ankaferd Blood Stopper on caustic esophageal injuries: an experimental model. Dis Esophagus. 2012 Apr;25(3):188-94. doi: 10.1111/j.1442-2050.2011.01231.x. Epub 2011 Aug 5. PMID: 21819483.

Çiftci A, Yilmaz B, Köklü S, Yüksel O, Özsoy M, Erden G, Öztürk G, Akbal E, Ergül B, Koçak E, Cesur S. Serum levels of nitrate, nitrite and advanced oxidation protein products (AOPP) in patients with nonalcoholic fatty liver disease. Acta Gastroenterol Belg. 2015 Jun;78(2):201-5. PMID: 26151688.

Payasli C, Hosnuter M, Babuccu O, Kargi E, Kocak E, Isikdemir A. Spotting the signs: a case of late diagnosed painful calciphylaxis. J Wound Care. 2005 Jan;14(1):12-3. doi: 10.12968/jowc.2005.14.1.26728. PMID: 15656457.

Ergül B, Koçak E, Köklü S. An unusual complication of ERCP: obstructive jaundice due to a blood clot. Clin Res Hepatol Gastroenterol. 2012 Apr;36(2):e40-1. doi: 10.1016/j.clinre.2011.12.015. Epub 2012 Jan 21. PMID: 22266180.

Başar O, Akbal E, Köklü S, Tuna Y, Koçak E, Başar N, Tok D, Erbiş H, Senes M. Increased H-FABP concentrations in nonalcoholic fatty liver disease. Possible marker for subclinical myocardial damage and subclinical atherosclerosis. Herz. 2013 Jun;38(4):417-22. doi: 10.1007/s00059-012-3714-x. Epub 2013 Jan 18. PMID: 23324907.

Sarikaya M, Koçak E, Köklü S, Babali A, Cakal B. Fatal fulminant hepatitis B after withdrawal of entecavir treatment in a patient with HBeAg seroconversion. Acta Gastroenterol Belg. 2012 Sep;75(3):369-70. PMID: 23082714.