1. Department of Community Health, University of Ghana Medical School, Accra P.O. Box 4236, Ghana
2. Princess Marie Louise Children’s Hospital, Accra P.O. Box GP 122, Ghana
3. Centre for Tropical Clinical Pharmacology and Therapeutics, University of Ghana Medical School, Accra P.O. Box 4236, Ghana
4. Family Medicine Department, Korle-Bu Teaching Hospital, Accra P.O. Box GP 4236, Ghana