[1] Trinity Coll Dublin, Adelaide & Meath Hosp Natl Childrens Hosp, Dept Gastroenterol, Dublin 24, Ireland
[2] Med Ctr Rogaska, Dept Gastroenterol, Rogashka Slatina, Slovenia
[3] CIBEREHD, Inst Invest Sanitaria Princesa IP, Hosp Univ Princesa, Gastroenterol Unit, Madrid, Spain