1. Department of Health Sciences, Unit of Global Health, University Medical Center Groningen, University of Groningen, 9713 AV Groningen, The Netherlands
2. Department of Economics, Econometrics & Finance, Faculty of Economics & Business, University of Groningen, 9749 AE Groningen, The Netherlands
3. Janssen Pharmaceutica NV, 2340 Beerse, Belgium
4. Janssen-Cilag NV, 2340 Beerse, Belgium
5. National Heart and Lung Institute, Imperial College London, London SW3 6LY, UK
6. Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, 3000 Leuven, Belgium