1. Danone Nutricia Research Uppsalalaan 12, 3584 CT Utrecht The Netherlands
2. Department of Pediatric Endocrinology Erasmus University Medical Centre – Sophia Children's Hospital Wytemaweg 80, 3015 CN Rotterdam, also representing the Mercurius Study Group The Netherlands
3. Department of Pediatrics University Medical Center Groningen Hanzeplein 1, 9713 GZ Groningen The Netherlands