1. Drug and Toxicology Information Service, Department of Pharmacy, University of Zimbabwe, Box A178, Avondale, Harare, Zimbabwe
2. Drug and Toxicology Information Service, Department of Pharmacy, University of Zimbabwe, Box A178, Avondale, Harare, Zimbabwe; Drug and Toxicology Information Service, Medical School, University of Zimbabwe, PO Box A178, Avondale, Harare, Zimbabwe;
3. Department of Clinical Pharmacology, University of Zimbabwe, Box A178, Avondale, Harare, Zimbabwe