1. School of Pharmacy University of Zimbabwe Harare Zimbabwe
2. Department of Health Sciences University Medical Center Groningen University of Groningen Groningen The Netherlands
3. Department of Medicine College of Health Sciences University of Zimbabwe Harare Zimbabwe
4. Department of Economics, Econometrics & Finance Faculty of Economics and Business University of Groningen Groningen The Netherlands
5. Department of Clinical Pharmacy and Toxicology Martini Hospital Groningen The Netherlands
6. Health Economics and Decision Science School of Health and Related Research University of Sheffield United Kingdom