1. Department of Pediatrics, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
2. University Health Care Research Center, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
3. Department of Women’s Health, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
4. Clinical Epidemiology and Biostatistics, School of Medical Sciences, Örebro University, Örebro, Sweden
5. Clinical Epidemiology Division, Department of Medicine, Karolinska Institutet, Solna, Sweden
6. Department of Epidemiology and Public Health, University College London, London, UK