1. From the Department of Medicine, Gastroenterology Division, King Saud University, Abha
2. Address reprint requests and correspondence to Dr. Al-Knawy: College of Medicine, King Saud University, P.O. Box 641, Abha, Saudi Arabia
3. Clinical Microbiology & Parasitology Division, King Saud University, Abha
4. Molecular Virology Department, Genelabs Inc., Redwood City, California, USA