1. School of Public Health Kamuzu University of Health Science Blantyre Malawi
2. Department of Anaesthesia and Intensive Care Queen Elizabeth Central Hospital Blantyre Malawi
3. Department of Anaesthesia and Intensive Care Bugando Medical Centre Mwanza Tanzania
4. Muhimbili University of Health and Allied Sciences Dar es Salaam Tanzania
5. Department of Clinical Research London School of Hygiene and Tropical Medicine London UK