[1] Adelaide & Meath Hosp, Dublin, Ireland
[2] Natl Childrens Hosp, Dept Clin Med, Dublin, Ireland
[3] Trinity Coll Dublin, Dept Clin Med, Dublin, Ireland
[4] Natl Childrens Hosp, Dept Dermatol, Dublin, Ireland
[5] St James Hosp, Coll Dublin, Dept Gastroenterol, Dublin, Ireland
[6] Natl Childrens Hosp, Dept Clin Med & Gastroenterol, Dublin, Ireland