[1] Univ Utrecht, Div Pharmacoepidemiol & Clin Pharmacol, UIPS, Fac Sci, Utrecht, Netherlands
[2] Univ Amsterdam, Dept Resp Med, Acad Med Ctr, Amsterdam, Netherlands
[3] Univ Med Ctr Utrecht, Dept Pediat Pulmonol & Allergol, Dept Pediat, Utrecht, Netherlands
[4] Royal Aberdeen Childrens Hosp, Child Hlth, Aberdeen, Scotland
[5] Royal Alexandra Childrens Hosp, Brighton & Sussex Med Sch, Acad Dept Pediat, Brighton, E Sussex, England
[6] Univ Dundee, Ninewells Hosp & Med Sch, Populat Pharmacogenet Grp, Biomed Res Inst, Dundee, Scotland
[7] Univ Utrecht, Div Pharmacol, UIPS, Fac Sci, Utrecht, Netherlands
[8] Nutricia Res, Utrecht, Netherlands
[9] Univ Dundee, Populat Pharmacogenet Grp, Biomed Res Ctr, Dundee, Scotland
[10] Univ Med Ctr, Dept Pediat, Erasmus MC, Div Resp Med & Allergol, Rotterdam, Netherlands
[11] Univ Med Ctr, Dept Epidemiol, Erasmus MC, Rotterdam, Netherlands
[12] Univ Med Ctr, Div Neonatol, Erasmus MC, Dept Pediat, Rotterdam, Netherlands
[13] Univ Utrecht, Inst Risk Assessment Sci, Fac Vet Med, Utrecht, Netherlands