1. From the Department of Medicine, College of Medicine and King Khalid University Hospital, King Saud University, Riyadh
2. From the Department of Pathology, College of Medicine and King Khalid University Hospital, King Saud University, Riyadh
3. Address reprint requests and correspondence to Dr. Ramia, Department of Pathology (32), College of Medicine, King Saud University, P.O. Box 2925, Riyadh 11461, Saudi Arabia