1. 1Hamad Medical Corporation Ambulance Service, P.O. Box 3050, Doha, Qatar
2. 2School of Health and Social Work, University of Hertfordshire, Hatfield AL10 9AB, Hertfordshire, UK
3. 3Department of Nursing, Midwifery, and Health, Northumbria University, Newcastle upon Tyne, UK
4. 4Medical Intensive Care Unit, Hamad General Hospital, Hamad Medical Corporation, P.O. Box 3050, Doha, Qatar