1. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
2. Clinical Epidemiology and Biostatistics, School of Medical Sciences, Örebro University, Örebro, Sweden
3. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden3Faculty of Medicine, Center of Public Health Sciences, School of Health Sciences, University of Iceland, Reykjavík4Department of Epidemiology, Harvard T. H. Chan School of Public Health, Boston, Massachusetts