1. Department of Molecular Medicine and Surgery; Section of Orthopaedics and Sports Medicine; Karolinska University Hospital; Karolinska Institutet; Stockholm Sweden
2. Department of Medicine; Clinical Pharmacology Unit; Karolinska University Hospital; Karolinska Institutet; Stockholm Sweden
3. Clinical Epidemiology and Biostatistics; Faculty of Medicine and Health; School of Health and Medical Sciences; Örebro University; Örebro Sweden
4. Clinical Epidemiology Unit; Karolinska University Hospital; Karolinska Institutet; Stockholm Sweden
5. Department of Epidemiology and Public Health; University College London; London UK