1. Nursing Administration, King Abdulaziz University Hospital, P.O Box 80215, Jeddah21589, Saudi Arabia
2. School of Nursing, University of Ottawa, 451 Smyth Road, OttawaON K1H 8M5Canada
3. School of Nursing, McMaster University, HamiltonON L8S 4K1, Canada
4. Ottawa Hospital Research Institute, Clinical Epidemiology Program, 501 Smyth Road, OttawaON K1H 8L6,Canada