1. From the Department of Pathology, College of Medicine, King Khalid University Hospital, Riyadh
2. Address reprint requests and correspondence to Dr. Al-Sohaibani: Department of Pathology, College of Medicine, King Khalid University Hospital, P.O. Box 2925, Riyadh 11461, Saudi Arabia
3. From the Department of Medicine, College of Medicine, King Khalid University Hospital, Riyadh