1. The Generation R Study Group University Medical Center Rotterdam Erasmus MC Rotterdam The Netherlands
2. Department of Dermatology University Medical Center Rotterdam Erasmus MC Rotterdam The Netherlands
3. Division of Respiratory Medicine and Allergology Department of Pediatrics University Medical Center Rotterdam Erasmus MC Rotterdam The Netherlands
4. Division of Neonatology Department of Pediatrics University Medical Center Rotterdam Erasmus MC Rotterdam The Netherlands
5. Department of Pediatrics University Medical Center Rotterdam Erasmus MC Rotterdam The Netherlands
6. Department of Epidemiology University Medical Center Rotterdam Erasmus MC Rotterdam The Netherlands
7. Department of Public Health and Primary Care Leiden University Medical Center Leiden The Netherlands