1. From the Internal Medicine Services Division, Dhahran Health Center, Saudi Aramco Medical Services Organization, Saudi Aramco, Dhahran, Saudi Arabia
2. Correspondence: Dr. Jaffar A. Al-Tawfiq · PO Box 76, Room A-420B, Building 61, Dhahran Health Center, Saudi Aramco, Dhahran 31311, Saudi Arabia · T: +966-3-877-3524 F: +966-3-877-3790 · jaffar.tawfiq@aramco