1. From the Department of Emergency Medicine, King Abdulaziz Medical City-National Guard Health Affairs, Riyadh, Saudi Arabia
2. Correspondence: Marzouqah AlAnazi, MD · Department of Emergency Medicine, King Abdulaziz Medical City-National Guard Health Affairs, Mail Code 1304, PO Box 22940, Riyadh 11426, Saudi Arabia · T: +966-1-252-0088 ext. 19993 F: +966-1-252-0088 ext. 19984 · as.dem.ahgn@1greme · Accepted for publication March 2009