Medicana International İstanbul, Beylikduzu Istanbul City Hospital, Spinal Unit of Orthopaedics Stellenbosch University, Tygerberg Academic Hospital, Spinal Unit AOSpine Ankara Spine Center, Memorial Hospital AOSpine Rizzoli Orthopaedics Institute, Spinal Tumors and Degenerative Diseases, Bologna, Italy AOSpine Rizzoli Orthopaedics Institute, Scoliosis and Adult Spinal Deformity, Bologna, Italy AOSpine Queen's University, Royal Victoria Hospital, Belfast, United Kingdom Gazi University School of Medicine, Orthopaedics. Dokuz Eylül University School of Medicine, Medical Faculty