[1] Univ Western Sydney, Sydney, NSW, Australia
[2] Univ Hosp, Serv Gastroenterol, Zaragoza, Spain
[3] Jung Stilling Krankenhaus, Dept Med, Siegen, Germany
[4] Dalhousie Univ, Div Gastroenterol, Halifax, NS, Canada
[5] Tygerberg Acad Hosp, Gastroenterol Unit, Stellenbosch, South Africa
[6] Petz Aladar Megyei Okato Korhaz, Belgyogyaszat, Gyor, Hungary