1. Center of Public Health Sciences, Faculty of Medicine, University of Iceland, Reykjavík, Iceland
2. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
3. Department of Epidemiology and Biostatistics, Faculty of Medicine, University of Iceland, Reykjavík, Iceland
4. Department of Rheumatology, University Hospital, Reykjavík, Iceland
5. Centre for Rheumatology Research, University Hospital, Reykjavík, Iceland
6. National Centre for Disaster Psychiatry, Department of Neuroscience, Psychiatry, Uppsala University, Uppsala, Sweden
7. Stress Research Institute, Stockholm University, Stockholm, Sweden
8. Centre for Psychiatry Research, Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
9. Stockholm Health Care Services, Stockholm County Council, Stockholm, Sweden
10. Astrid Lindgren Children’s Hospital, Karolinska University Hospital, Stockholm, Sweden
11. Clinical Epidemiology and Biostatistics, School of Medical Sciences, Örebro University, Örebro, Sweden
12. Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts