1. From the Department of Radiology and Medical Imaging, College of Medicine, King Saud University, Riyadh, Saudi Arabia
2. Correspondence: Nizar A. Al-Nakshabandi · Department of Radiology and Medical Imaging, College of Medicine, King Saud University, Riyadh 11472, Saudi Arabia · T: +9661-4671155, F: +9661-4671 746 · nizar97@hotmail.com · Accepted: September 2010