1 Department of Anaesthesiology and Intensive Care, Bayero University/Aminu Kano Teaching Hospital, PMB 3452, Kano, Nigeria.
2 Department of Anaesthesia and Intensive Care Unit, Livingstone Central Hospital, 2444/244B, Highlands, Livingstone, Southern Province, Zambia.
3 Department of Anesthesiology, Perioperative and Pain Medicine, Stanford University Hospital, 300 Pasteur Drive, Room H3580, MC 5640, Stanford, CA, 94305, USA. [email protected].