1. King Abdullah Medical Complex-Jeddah (KAMCJ), Al-Ameer Nayef Street, North Obhur, P.O. Box 55659, Jeddah 21544, Saudi Arabia
2. Department of Medicine, Rheumatology Section, Hamad Medical Corporation, P.O. Box 3050, Off Al Rayyan Road, Opposite Lulu Center, Doha, Qatar