1. Department of Pediatrics, Albert Schweitzer Hospital Dordrecht, The Netherlands,
2. Department of Pediatrics, Leiden University Medical Centre Leiden, The Netherlands,
3. Department of Pediatrics, Division of Respiratory Medicine, Erasmus MC – Sophia Children’s Hospital Rotterdam, The Netherlands,
4. Department of Epidemiology, Erasmus MC Sophia – Children’s Hospital Rotterdam, The Netherlands, and
5. Department of Gynaecology, Albert Schweitzer Hospital Dordrecht, The Netherlands