1. From the Department of Internal Medicine, King Fahad Medical City, Riyadh, Saudi Arabia
2. Correspondence: Khalid Al-Matham, MD · Department of Internal Medicine, Main Hospital, King Fahad Medical City, PO Box 59046, Riyadh 11525, Saudi Arabia · M: +966-55526-5640 · khalidosis@hotmail.com · Accepted date: April 2010