1. From the Department of Internal Medicine, Faculty of Medicine, Umm Al-Qura University, Makkah, Saudi Arabia
2. Correspondence: Abdulaziz Alhasan, MBBS · Department of Internal Medicine, Faculty of Medicine, Umm Al-Qura University, PO Box 3551, Makkah, Saudi Arabia · T: +966-55-554-3460 · aalhasan@uqu.edu.sa · Accepted for publication February 2009
3. From the Department of Internal Medicine, King Fahad Armed Forces Hospital, Jeddah, Saudi Arabia