[1] Univ Childrens Hosp, Het Wilhelmina Kinderziekenhuis, Dept Paediat Gastroenterol, NL-3501 CA Utrecht, Netherlands
[2] Univ Childrens Hosp, Dept Endocrinol, NL-3501 CA Utrecht, Netherlands
[3] Univ Childrens Hosp, Dept Psychol, NL-3501 CA Utrecht, Netherlands