1. Pediatric Department, Spaarne Gasthuis, 2035 RC Haarlem and 2134 TM Hoofddorp, The Netherlands
2. Pediatric Department, OLVG, 1091 AC Amsterdam, The Netherlands
3. Department of Development and Regeneration, KU Leuven, 3000 Leuven, Belgium
4. Child and Youth Institute Leuven, KU Leuven, 3000 Leuven, Belgium
5. Pediatric Department, UZ Leuven, 3000 Leuven, Belgium
6. Spaarne Gasthuis Academy, Spaarne Gasthuis, 2134 TM Hoofddorp, The Netherlands
7. Centre for Sociological Research, KU Leuven, 3000 Leuven, Belgium