1. Clinical Epidemiology and Biostatistics School of Medical Sciences Örebro University Örebro Sweden
2. Department of Public Health Sciences Stockholm University Stockholm Sweden
3. Faculty of Medicine and Health School of Health Sciences Örebro University Örebro Sweden
4. Department of Medical Epidemiology and Biostatistics Karolinska Institutet Stockholm Sweden
5. Clinical Epidemiology Division Department of Medicine Karolinska University Hospital Solna Karolinska Institutet Stockholm Sweden
6. Department of Epidemiology and Public Health University College London London UK