1. Department of Medicine, Princess Marina Hospital, Gaborone, Botswana
2. Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
3. School of Pharmacy, Sefako Makgatho Health Sciences University, Pretoria, South Africa
4. Division of Clinical Pharmacology, Karolinska Institute, Karolinska University Hospital Huddinge, Stockholm, Sweden
5. Department of Internal Medicine, University of Botswana, Gaborone, Botswana