1. The Generation R Study Group, Erasmus MC; University Medical Centre Rotterdam; Rotterdam The Netherlands
2. Department of Pediatrics, Division of Respiratory Medicine and Allergology, Erasmus MC; University Medical Centre Rotterdam; Rotterdam The Netherlands
3. Department of Epidemiology, Erasmus MC; University Medical Centre Rotterdam; Rotterdam The Netherlands
4. Department of Pediatrics, Erasmus MC; University Medical Centre Rotterdam; Rotterdam The Netherlands
5. COPSAC (Copenhagen Prospective Studies on Asthma in Childhood), Faculty of Health and Medical Sciences; University of Copenhagen; Copenhagen Denmark
6. Danish Pediatric Asthma Center, Gentofte Hospital; The Capital Region; Copenhagen Denmark
7. Department of Pediatrics, Division of Neonatology, Erasmus MC; University Medical Centre Rotterdam; Rotterdam The Netherlands