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