1. Department of Internal Medicine, Division of Rheumatology, American University of Beirut, Beirut, Lebanon
2. Department of Neurosurgery, Gilbert and Rose-Marie Chagoury School of Medicine, Lebanese American University, Beirut, Lebanon
3. Department of Surgery, Division of Orthopedic Surgery, American University of Beirut, Beirut, Lebanon
4. Department of Rheumatology, The Royal London Hospital, Bancroft Road, London E1 4DG, United Kingdom