1. Unit Pharmacotherapy ‐Epidemiology and ‐Economy, Groningen Research Institute of PharmacyUniversity of Groningen Groningen The Netherlands
2. Expertise Centre Pharmacotherapy in Old Persons Oranjewoud The Netherlands
3. Department of Internal Medicine‐subdivision Vascular MedicineErasmus Medical Center Rotterdam The Netherlands
4. Anticoagualation CenterDeventer Hospital Deventer The Netherlands