1. Department of Anesthesiology and Critical Care, Faculty of Medicine and Biomedical Sciences, University of Yaoundé I, Yaoundé, Cameroon
2. Faculty of Medicine and Pharmaceutical Sciences, University of Douala, Douala, Cameroon
3. Department of Emergency Medicine, Anesthesiology and Critical Care, Douala General Hospital, Douala, Cameroon
4. Department of Anesthesiology and Critical Care, Gynaeco-Obstetrics and Paediatric Hospital, Yaoundé, Cameroon