1. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Solna, Sweden
2. Department of Pediatrics, Orebro University Hospital, Orebro, Sweden
3. Division of Epidemiology and Public Health, School of Medicine, University of Nottingham, UK
4. Department of Medicine, Columbia University College of Physicians and Surgeons, New York, NY, USA
5. Sachs’ Children and Youth Hospital, Stockholm South General Hospital, Stockholm, Sweden
6. Department of Clinical Science and Education Södersjukhuset, Karolinska Institutet, Stockholm, Sweden
7. Clinical Epidemiology Division, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden
8. School of Medical Sciences, Örebro University, Sweden
9. Department of Gastroenterology, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
10. Pediatric Allergy and Pulmonology Unit, Astrid Lindgren Children’s Hospital, Karolinska University Hospital, Stockholm, Sweden
11. Child and Adolescent Psychiatry Stockholm, Stockholm Health Care Services, Region Stockholm, Sweden
12. Department of Child Psychiatry, Medical University of Warsaw, Warsaw, Poland