1. The Generation R Study GroupErasmus MC University Medical Center Rotterdam Rotterdam the Netherlands
2. Department of DermatologyErasmus MC University Medical Center RotterdamRotterdam the Netherlands
3. Department of Paediatrics Division of Respiratory Medicine and AllergologyErasmus MCUniversity Medical Center Rotterdam Rotterdam the Netherlands
4. Department of Child and Adolescent Psychiatry/PsychologyErasmus MCUniversity Medical Center Rotterdam Rotterdam the Netherlands
5. Department of Psychology, Education and Child Studies Erasmus University Rotterdam Rotterdam the Netherlands
6. Department of Paediatrics Division of Neonatology Erasmus MC University Medical Center Rotterdam Rotterdam the Netherlands