Authors: Klaartje van Engelen; Johannes H M Merks; Jan Lam; Leontien C M Kremer; Manouk Backes; Marieke J H Baars; Heleen J H van der Pal; Alex V Postma; Rogier Versteeg; Huib N Caron; Barbara J M Mulder Journal: Eur J Pediatr Date: 2008-12-17 Impact factor: 3.183