[1] Zuyderland Med Ctr, Paediat, Heerlen, Netherlands
[2] Univ Hosp Antwerp, Paediat Gastroenterol Hepatol & Nutr, Edegem, Belgium
[3] Maastricht Univ Med Ctr, Gastroenterol & Hepatol, Maastricht, Netherlands
[4] Dr Horacio Oduber Hosp, Gen Paediat & Adolescent Care, Oranjestad, Aruba
[5] Catharina Hosp, Paediat, Eindhoven, Netherlands
[6] Maxima Med Ctr, Paediat, Veldhoven, Netherlands
[7] Jeroen Bosch Hosp, Paediat, Shertogenbosch, Netherlands
[8] Gelre Hosp, Paediat, Apeldoorn, Netherlands
[9] Isala Clin, Paediat, Zwolle, Netherlands
[10] Erasmus MC, Paediat Gastroenterol Hepatol & Nutr, Rotterdam, Netherlands
[11] Univ Hosp Ghent, Internal Med & Paediat, Ghent, Belgium
[12] Maastricht Univ, Methodol & Stat, Maastricht, Netherlands
[13] Zuyderland Med Ctr, Clin Chem & Hematol, Heerlen, Netherlands
[14] Maastricht Univ Med Ctr, Paediat Gastroenterol & Hepatol, Maastricht, Netherlands
[15] Univ Med Ctr Groningen, Paediat Gastroenterol Hepatol & Nutr, Groningen, Netherlands