1. From the internal Medicine Services Division, Saudi Aramco Medical Services Organization, Dhahran Health Center, Saudi Arabia
2. Correspondence: Dr. jaffar A. Al-Tawfiq · Room A-428-2B, Building 61, Dhahran Health Center, Saudi Aramco, PO Box 76, Dhahran 31311, Saudi Arabia · T: +966-3-877-8533 F: +966-3-877-3790 · jaffar.tawfiq@aramco.com/jaltawfi@yahoo.com · Accepted for publication August 2009
3. From the Cardiology Services Division, Saudi Aramco Medical Services Organization, Dhahran Health Center, Saudi Arabia