aSahlgrenska Osteoporosis Centre, Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, University of Gothenburg, Gothenburg, Sweden

bMary MacKillop Institute for Health Research, Australian Catholic University, Melbourne, VIC, Australia

cRegion Västra Götaland, Department of Geriatric Medicine, Sahlgrenska University Hospital, Mölndal, Sweden

dHolbæk Hospital, Department of Medicine, Holbæk, Denmark

eNuffield Department of Rheumatology and Musculoskeletal Science, University of Oxford, Oxford, UK

fOpen Patient Data Explorative Network (OPEN), University of Southern Denmark and Odense University Hospital, Odense, Denmark

Correspondence to Professor Bo Abrahamsen, Holbæk Hospital, Department of Medicine, DK-4300 Holbæk, Denmark. Tel: +45 9356 6351; e-mail: [email protected]