1. Adult Infectious Diseases Unit, Department of Internal Medicine University Teaching Hospital Lusaka Zambia
2. Allergy and Immunology Unit University of Cape Town Lung Institute Cape Town South Africa
3. Division of Allergy and Clinical Immunology, Department of Medicine Groote Schuur Hospital, University of Cape Town Cape Town South Africa
4. Department of Dermatology and Venereology Section (Skin and STI Clinic) University Teaching Hospital Lusaka Zambia