1. Federal University, Dutse, Jigawa, Nigeria
2. Department of Anaesthesia and ICU, Rasheed Shekoni Teaching Hospital, Dutse, Jigawa, Nigeria
3. Department of Anaesthesia and ICU, Abubakar Tafawa Balewa University Teaching Hospital, Bauchi, Nigeria
4. Department of Anaesthesia and ICU, Aminu Kano University Teaching Hospital, Kano, Nigeria