1. Department of Anaesthesia, School of Medicine and Dentistry, College of Health Sciences, Korle-Bu Teaching Hospital, University of Ghana, Accra, Ghana
2. Department of Internal Medicine, Korle-Bu Teaching Hospital, Accra, Ghana
3. Department of Anaesthesia, Trust Hospital, Accra, Ghana
4. Department of Community Health, School of Public Health, University of Ghana, Korle-Bu, Ghana