1. The Generation R Study Group; Erasmus Medical Center; Rotterdam The Netherlands
2. Department of Dermatology; Erasmus Medical Center; Rotterdam The Netherlands
3. Division of Respiratory Medicine; Department of Pediatrics; Erasmus Medical Center; Rotterdam The Netherlands
4. Division of Neonatology; Department of Pediatrics; Erasmus Medical Center; Rotterdam The Netherlands
5. Department of Epidemiology; Erasmus Medical Center; Rotterdam The Netherlands
6. Department of Pediatrics; Erasmus Medical Center; Rotterdam The Netherlands