[1] SUNY Downstate Hlth Sci Univ, Dept Med, Div Gastroenterol & Hepatol, 450 Clarkson Ave, Brooklyn, NY 11203 USA
[2] Aga Khan Univ Hosp, Sect Gastroenterol, Karachi, Pakistan
[3] Al Azhar Univ, Dept Internal Med, Cairo, Egypt
[4] Univ Sao Paulo, Inst Canc Sao Paulo State, Sao Paulo, Brazil
[5] Hosp Guillermo Kaelin Fuente, EsSalud, Lima, Peru
[6] Hue Univ Med & Pharm, Dept Internal Med, Ho Chi Minh City, Vietnam
[7] Singapore Gen Hosp, Duke NUS Med Sch, Dept Gastroenterol, Singapore, Singapore
[8] Dow Univ Hlth Sci, Civil Hosp Karachi, Dept Surg, Karachi, Pakistan
[9] Ahvaz Jundishapur Univ Med Sci, Alimentary Tract Res Ctr, Ahvaz, Iran
[10] Univ Nairobi, Dept Clin Med & Therapeut, Nairobi, Kenya
[11] Consultant Gastroenterologist & Phys Kettering Ge, Kettering, England
[12] Mem Sloan Kettering Canc Ctr, Dept Med, Gastroenterol Hepatol & Nutr Serv, 1275 York Ave, New York, NY 10021 USA
[13] Singapore Gen Hosp, Duke NUS Med Sch, Dept Gastroenterol & Hepatol, Singapore, Singapore
[14] Western Hlth, Melbourne, Vic, Australia
[15] Univ Melbourne, Melbourne, Vic, Australia
[16] Natl Taiwan Univ Hosp, Dept Internal Med, Taipei, Taiwan
[17] Boston Univ, Sch Med, Sect Gastroenterol, Boston, MA 02118 USA
[18] Scripps Green Hosp, Scripps Clin, Div Gastroenterol, San Diego, CA USA