1. Department of Pediatrics and Adolescent Medicine, Herlev Hospital, Herlev, Denmark
2. Section of Biostatistics, University of Copenhagen, Copenhagen, Denmark
3. National Institute of Public Health, University of Southern Denmark, Copenhagen, Denmark
4. Center of Adolescent Medicine, Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark
5. Department of Pediatrics and Adolescent Medicine, Nordsjællands Hospital, Hillerød, Denmark
6. Institute of Clinical Medicine, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark
7. Institute of Public Health, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark