1 Department of Pharmacy, University of Zambia, Lusaka, Zambia.
2 Department of Pharmacoepidemiology, Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow G4 0RE, UK; Division of Clinical Pharmacology, Karolinska Institute, Karolinska University Hospital Huddinge, Stockholm, Sweden; Department of Pharmacy, Faculty of Health Sciences, Sefako Makgatho Health Sciences University, Pretoria, South Africa; Health Economics Centre, University of Liverpool Management School, Liverpool, UK. Electronic address: [email protected].