1. Utrecht Institute of Pharmaceutical Sciences, Utrecht University, The Netherlands
2. General Practice Research Database, Medicines and Healthcare Products Regulatory Agency, London, UK
3. MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton, UK
4. MS Center Amsterdam, VU University Medical Center, Amsterdam, The Netherlands
5. Institute of Musculoskeletal Sciences, University of Oxford, Oxford, UK
6. The Osteoporosis Clinic, Aarhus University Hospital, Aarhus, Denmark
7. National Institute of Public Health, University of Southern Denmark, Copenhagen, Denmark
8. Department of Clinical Pharmacy and Toxicology, Maastricht University Medical Centre, Maastricht, The Netherlands