[1] King Abdulaziz Univ, Fac Med, Dept Orthoped, Jeddah, Saudi Arabia
[2] McGill Univ, McGill Scoliosis & Spine Grp, Montreal, PQ, Canada
[3] Sarawak Gen Hosp, Dept Orthoped Surg, Jalan Tun Ahmad Zaidi Adruce, Kuching, Malaysia
[4] Policlin G Rodolico Univ Hosp, Dept Neurosurg, Catania, Italy
[5] Univ Utah, Dept Orthopaed, Salt Lake City, UT USA
[6] Alrazi Hosp, Kuwait Inst Med Specializat, Minist Hlth, Adailiya, Kuwait
[7] Columbia Univ, Och Spine Hosp, Dept Orthoped Surg, New York, NY USA
[8] Univ Caxias do Sul, Dept Neurosurg, Caxias Do Sul, RS, Brazil