[1] Copenhagen Univ Hosp, Amager & Hvidovre Hosp, Dept Paediat & Adolescent Med, Copenhagen, Denmark
[2] Copenhagen Univ Hosp Amager & Hvidovre, Gastrounit Med Div, Copenhagen, Denmark
[3] Royal Hosp Children & Young People, Dept Paediat Gastroenterol & Nutr, Edinburgh, Scotland
[4] Copenhagen Univ Hosp Amager & Hvidovre, Dept Paediat & Adolescent Med, Copenhagen, Denmark