1. Dental Public Health Division, Preventative Dentistry Department, College of Dentistry, Umm Al-Qura University, Makkah, Saudi Arabia
2. Department of Orthopedic Surgery, King Abdulaziz University, Jeddah, Saudi Arabia
3. Department of Orthopaedic Surgery, King Fahd Hospital of the University, Imam Abdulrahman Bin Faisal University, Al-Khobar, Saudi Arabia
4. Department of Surgery, Faculty of Medicine, University of Tabuk, Tabuk, Saudi Arabia
5. Division of Neurosurgery, Department of Surgery, King Khalid University, Abha, Saudi Arabia
6. Department of Orthopedic Surgery, College of Medicine, King Saud University, Riyadh, Saudi Arabia
7. Department of Internal Medicine, College of Medicine, Taibah University, Almadinah Almunawwarah, Saudi Arabia