1. Özdoğan, A.J. Sadallah, G. Emirönal, B.Ç. Yeğen, N.B. Ulusoy. Temperature dependence of esophageal motor function in man revisited. 7. European Motility Congress, Toulouse, France, 1994. Neurogastenterol.Mot.1994; 6,166 (poster).
  2. Ersöz H, Ozdoğan O., Özener Ç, Ercan N, Akoğlu E. Endothelin 1 levels in type II diabetic patients during the initial phase of nephropathy.. 8th Balkan Congress of Endocrinology 1995 .
  3. Turgay Çelikel, Berrin Ceyhan, Murat Sungur, Armend Sipahu, Osman Özdoğan. Salmeterol therapy in astma and chronic obstructive lung disease. International Conference 1995 (poster). Respiratory and Critical Care Medicine 1995, A 463.
  4. Özdoğan, N. Tözün, Z. Gören, H. Mouni, K. Berkman. Endothelin-1 in hepatorenal syndrome: Is endothelin-1 receptor antagonist (Bosentan) effective. AGA 1997, Washington (poster). Gastroenterology 1997, 112, A1354.
  5. Giral, O. Özdoğan, Ç. Çelikel, N.B. Ulusoy, N. Tözün, C. Kalaycı. Does eradication of H.Pylori reduce low dose aspirin induced gastroduodenal injury. AGA 1997 Washington (poster). Gastroenterology 1997, 112, A127.
  6. Giral, N. Aytuğ, O. Özdoğan, N. Bekiroğlu, F. Enç, N. B. Ulusoy. Cırcadıan varıatıon of phase III contractıons of the jejunal mıgratıng motor complex. European Motility Congress, Bologna, Italy 2000.
  7. Yeşim Özen, Hicham Al Ahdap, Faysal Dane, Osman Özdoğan, Siret Ratip, Neşe İmeryüz, Nurdan Tözün. Incidence and risk factors for liver injury following bone marrow transplantation. GUT 47 (Supll III) A 172, 2000.
  8. Deniz Güney, Ufuk över, Hülya Över Hamzaoğlu, Osman Özdoğan, Neşe İmeryüz, Güner Söyletir, Nurdan Tözün. Does Amebiasis Cause Flare Up of Inflamatuary Bowel Disease. GUT 47 (Supll III) A 224, 2000.
  9. Adnan Giral, Yücel Gültekin, Kemal Memişoğlu, Teoman Parmaksızoğlu, Neşe İmeryüz, Osman Özdoğan, Cem Kalaycı, Nurdan Tözün, Nefise Barlas Ulusoy. Comparison of Botulinum Toxin Injection and Lateral Internal Sphincterotomy in The Treatment of Chronic Anal Fissure. SSAT Poster Session. M2045.
  10. M Guevara, G.Fernandez-Esparrach, P.Gines, B. Calahorra, Özdoğan, T.Testuccia, X. Montaya, C.Pierra, M.L. Alvarez, W.Jimenez, V.Arroyo, J.Rodes. Effect of Radıocontrast agents on renal function in patients with cirrhosis and ascites. Journal of Hepatology, Volume 36, Suplement 1, A718, 2002.
  11. Guevara, O. Ozdogan, P. Gines, C. Alessandria, T. Restuccia, D. de las Heras, J. Colmenero, B. Calahorra, V. Arroyo, J. Rodes. Relationship between circulatory function and severity of renal failure in patients with cirrhosis and hepatorenal syndrome. 38. Avrupa Hepatoloji Kongresi 2003, Abstract no: 3853, J Hepatol, Volume 38, Suplement 2, A187, 2003.
  12. Ozdogan*, M. Guevara, P. Gines, C. Alessandria, T. Restuccia,
    D. de las Heras, J. Colmenero, B. Calahorra, V. Arroyo, J. Rodes. Predictive Factors And Outcome Of Hepatorenal Syndrome In Cirrhosis. Relevance Of Serum Sodium Concentration. . 38. Avrupa Hepatoloji Kongresi 2003, Abstract no: 3621, J Hepatol, Volume 38, Suplement 2, A210, 2003
  13. Restuccia*, M. Guevara,  P. Gines,  C. Alessandria, D. De las Heras,  B. Calahorra,  R. Ortega,  O. Ozdogan,  M. Navasa,  A. Rimola,  J.C. Garcia-Valdecasas,  V. Arroyo,  J Rodes. Impact Of Pretransplant Treatment Of Hepatorenal Syndrome (Hrs) With Vasopressin Analogues On Outcome After Liver Transplantation (Ltx). A Case-Control Study. 38. Avrupa Hepatoloji Kongresi 2003, Abstract no: 4332, J Hepatol, Volume 38, Suplement 2, A222, 2003
  14. Türe Özdemir F, Duman D, Ertem D, Avşar E, Ozdogan O, Eren F, Kalaycı C, Aslan N, Dozdayı M, Tozun N. Determination of hepaitits B genotypes in patients with chronic hepatitis B virus infection in Turkey. APASL , 14th biennial Conference, India, 2004. Journal of Gastroenterology and Hepatology, vol 19, supplement december 2004, A774.
  15. C Ozdoğan, H. Atalay, C. Cimşit, F.Baltacioğlu, D.Tüney, A.Giral, E.Avşar, C. Kalaycı, C. Erzen, N. Tözün. Is Doppler ultrasonography a reliable tecnique fot the evaluation of post-prandial hyperemia? 12. UEGW; United European Gastroenterology Week, 2004. GUT, vol 36, no :1, A 260, 2004.
  16. Atuğ Ö, Kurtkaya O, Hamzaoğlu H, İmeryüz N, Özdoğan O, Sav A, Tözün N. Heat Shock protein 60 and Heat shock protein 72 expression in the mucosa of patients with ulcerative colitis.
  17. Ozdogan O,Atalay, C.Cimşit, H.Akin, E.Avşar, D. Tüney. Glucagon is the responsible peptide in post-prandial hyperemia of cirrhptic patients. 13. UEGW, Copanhagen 2005. GUT vol 37, no:1, A 198, 2005.
  18. Uraz, V.Tahan, C.Aygun, F.Eren, M.Yüksel, G.Unlugüzel, O. Özdoğan, O. Şentürk, E.Avşar, G.Haklar, C.Çelikel, S.Hulagu, N. Tözün. Role of Ursodeoxycholic acid in the prevention of methotrexate induced liver toxicity. EASL 40. Yıllık Kongre, Paris 2005. Journal of Hepatology vol 12, suppl. 1, sayfa 255, 2005.
  19. Hakan Akın, Zekaver Odabaşı, Hüseyin Atalay, Hüseyin Koçak, Gülçin Kantarcı, Nadi Bakırcı, Çetin Özener, Osman Özdoğan, Nurdan Tözün. Disaster Medicine: Is stres ulcer prophylaxis needed for Crush Syndrome patients after earthquakes? Expreience of a referral hospital, Turkey. 107th Amerikan Gastroenteroloji Derneği Kongresi, Los Angles 2006. Gastroenterology vol 103, number 4, suppl.2, A-305, 2006.
  20. Fatih Eren, Melike Avşar, Filiz Türe Özdemir, Defne Tamar, Veysel Tahan, Onur Karatuna, Güner Söyletir, Osman Özdoğan, Neşe İmeryüz, Erol Avşar, Nurdan Tözün. Occult HBV infection in Turkish IV drug users. 17th APASL Kongresi, Kyoto, 2007. Hepatology International, vol 1, no: 1, p118, 2007.
  21. Türe Özdemir, F.Eren, A.Tiftikçi, V.Tahan, H.Akın, F.Gündüz, A.Kedrah, Y.Üstündağ, E.Avşar, N.Tözün, O.Özdoğan. The prevelance of the mutataion in codon 249 of the P53 gene in patients with Hepatocellular carcinoma in Turkey. EASL Monothematic Conference, Prague, 2008. Kongre Kitabı Sayfa 81.
  22. Al Ahdap, B.Aktaş, I. Kaygusuz, F. Gündüz, A. Kedrah, M. Çetiner, T. Tuğlular, M. Bayık, O. Özdoğan, N. Tözün. Rate and type of liver injury after BMT may depend on the conditioning regimen in patients with hematological malignancies. EASL 43th yıllık Kongresi, Milano, 2008. Journal of Hepatology, vol 48, supl. 2, S335, 2008.
  23. Eren, N. Tözün, F. Türe Özdemir, H. Över Hamzaoğlu, N. İmeryüz, O. Özdoğan, E.Avşar. Codon 72 Polymorphism of P53 gene is associated with an increased susceptibility to .hepatocellular carcinoma in the Turkish population. European Human Genetics Conference, Viyana, 2009. European Journal of Human Genetics vol 17, Supl. 2, sayfa 175, 2009.
  24. Filiz Türe-Özdemir, Nurdan Tözün, Arzu Tiftikçi, Fatih Eren, Hakan Akın, Feyza Gündüz, Yeşim Alahdab, Neşe İmeryüz, Erol Avşar, Yücel Üstündağ Osman Özdoğan. Toll-like receptor-4 (Asp299Gly and Thr399Ile) and CD14 (-159) polymorphisms in Turkish patients with Hepatocellular Carcinoma. Basic Science Workshop, Cambridge 2009. Sykymbayev1*, F. Eren2, A. Tiftikçi3, F. Türe2, F. Gündüz4, O. Ozdogan4“VEGF, BFGF & ENDOSTATIN DO NOT PREDICT PROGNOSIS IN HEPATOCELLULAR CARSINOMA PATIENTS ” EASL Viyana 2010.
  25. Tözün N, Özdoğan O, Çakaloğlu Y, İdilman R, Karasu Z, Akarca U, Kaymakoğlu S, Ergönül Ö .A Nationwide Prevalence Study and Risk Factors for Hepatitis A, B, C and D Infections in The 61st Annual Meeting of the American Association for the Study of Liver Diseases: The Liver Meeting® 2010 .October 29 November 2  2010 ,Boston USA, Poster No: 789 , HepatologyVol 52, S1:697A.
  26. “TOLL-LIKE RECEPTOR 4 (ASP299GLY &THR399ILE) & CD14 (C-159T) POLYMORPHISMS IN CHRONIC VIRAL HEPATITIS B AND C IN TURKISH POPULATION. EASL Monothematic Conference on “Immune Mediated Liver Injury” , Stratford-upon-Avon, January 19-21, 2012.
  27. Serum endostatIn level Is assocIated wIth poor survIval In patIents wIth advanced stages of hepatocellular carcinoma. EASL Amsterdam 2013.
  28. “INFECTIONS WITH RESISTANT BACTERIA IN HOSPITALIZED CIRRHOTIC PATIENTS CAUSE LONGER HOSPITAL STAY AND FREQUENT ICU TRANSFER” EASL Londra, 2014.