1. Ghent University; Department of General Practice and Primary Health Care; De Pintelaan 185, UZ-6K3 Ghent Belgium B-9000
2. Ghent University Hospital; Department of Geriatrics; De Pintelaan 185, UZ-1K2 Ghent Belgium B-9000
3. Ghent University; Heymans Institute of Pharmacology; Ghent Belgium
4. Heymans Institute of Pharmacology; Ghent University Ghent Belgium B-9000
5. The University of Queensland; Discipline of General Practice, School of Medicine; Brisbane Queensland Australia 4006