[1] Copenhagen Univ Hosp Amager & Hvidovre, Gastro Unit, Hvidovre, Denmark
[2] Univ Copenhagen, Dept Clin Med, Copenhagen, Denmark
[3] Cent Clin Augsburg Gastroenterol, Augsburg, Germany
[4] St Pauls Hosp, Millennium Med Coll, Dept Internal Med, Addis Ababa, Ethiopia
[5] Kwame Nkrumah Univ Sci & Technol, Dept Med, Kumasi, Ghana
[6] Enugu State Univ, Teaching Hosp, Dept Med, Enugu, Nigeria
[7] Sapienza Univ Rome, Dept Anat Histol Forens Med & Orthoped Sci, Rome, Italy
[8] Osped Castelli Hosp, Gastroenterol & Digest Endoscopy Unit, Rome, Italy
[9] Australian Natl Univ, Med Sch, Canberra, ACT, Australia
[10] Canberra Hosp, Gastroenterol & Hepatol Unit, Canberra, ACT, Australia
[11] Univ Sierra Leone Teaching Hosp Complex, Dept Pathol, Freetown, Sierra Leone
[12] Tech Univ Munchen TUM, Munich, Germany
[13] Univ Nigeria Teaching Hosp, Dept Med, Gastroenterol Unit, Enugu, Nigeria
[14] Hop Edouard Herriot, Gastroenterol & Endoscopy, Lyon, France
[15] Georges Pompidou European Hosp, Gastroenterol, Paris, France
[16] Oslo Univ Hosp, Dept Transplantat Med, Rikshosp, Oslo, Norway
[17] Univ Oslo, Fac Med, Oslo, Norway
[18] Humanitas Univ, Dept Biomed Sci, Milan, Italy
[19] IRCCS Humanitas Res Hosp, Dept Gastroenterol, Via Manzoni 56, I-20089 Milan, Italy