1. From the Departments of Pediatrics and Internal Medicine, King Faisal Specialist Hospital and Research Centre, and King Khalid University Hospital, Riyadh, Saudi Arabia.
2. Address reprint requests and correspondence to Dr. Bahabri: Department of Pediatrics (MBC 58), King Faisal Specialist Hospital and Research Centre, P.O. Box 3354, Riyadh 11211, Saudi Arabia.