[1] Univ Marburg, Dept Internal Med, D-3550 Marburg, Germany
[2] Chinese Acad Med Sci, Peking Union Med Coll Hosp, Dept Gastroenterol, Beijing 100037, Peoples R China
[3] Hop Sirio Libanes, Ctr Oncol, Sao Paulo, Brazil
[4] Univ Verona, Gen Surg Sect, Dept Med & Surg, I-37100 Verona, Italy
[5] Hadassah Univ Hosp, Dept Endocrinol & Metab, IL-91120 Jerusalem, Israel
[6] St Bartholomews Hosp, Dept Endocrinol, London, England
[7] Univ Hosp Martin, Dept Internal Med 2, Martin, Slovakia
[8] Slaska Akad Med, Klin Endokrynol, Zabrze, Poland
[9] Inst Catala Oncol, Barcelona, Spain
[10] Charite, Campus Virchow Klinikum, Dept Gastroenterol & Hepatol, D-13353 Berlin, Germany