1. McGill Scoliosis & Spine Centre, McGill University Health Centre, Montreal, Canada
2. Department of Orthopedic Surgery, University of Tabuk, Tabuk, Saudi Arabia
3. Department of Orthopedic Surgery, University of Dammam, Al-Dammam, Saudi Arabia
4. Department of Orthopedic Surgery, King Abdulaziz University, Jeddah, Saudi Arabia
5. Spectrum Research, Inc., Tacoma, Washington, United States