[1] Med Univ Vienna, Innere Med Klin 3, Gastroenterol & Hepatol Abt, A-1090 Vienna, Austria
[2] Univ Zurich Hosp, CH-8091 Zurich, Switzerland
[3] Univ Iowa Hlth Care, Iowa City, IA USA
[4] Hosp Clin Barcelona, Barcelona, Spain
[5] Univ Toronto, Univ Hlth Network, Toronto, ON M5S 1A1, Canada
[6] Toronto Western Hosp, Toronto, ON M5T 2S8, Canada
[7] Univ Alberta, Edmonton, AB, Canada
[8] Univ Tokyo, Tokyo, Japan
[9] NKC Inst Gastroenterol & Hepatol, Songkhla, Thailand
[10] Univ Cape Town, ZA-7925 Cape Town, South Africa
[11] Univ Ibadan, Ibadan, Nigeria
[12] Zhejiang Univ, Coll Med, Hangzhou 310003, Zhejiang, Peoples R China
[13] GB Pant Hosp, New Delhi, India
[14] Aga Khan Univ Hosp, Karachi, Pakistan
[15] Med Inst Hayatabad Med Complex, Peshawar, Pakistan
[16] Otto VonGuericke Univ Magdegurg, Madeburg, Germany
[17] Univ Klinikum Leipzig AoR, Leipzig, Germany
[18] Ibn Sina Hosp, Natl Ctr Gastrointestinal & Liver Dis, Baghdad, Iraq
[19] Univ Khartoum, Khartoum, Sudan
[20] Prince Wales Hosp, Hong Kong, Hong Kong, Peoples R China
[21] Univ Sao Paulo, Sch Med, Sao Paulo, Brazil
[22] Highland Data, Tourtoirac, France
[23] Highland Data, Amsterdam, Netherlands