1. Warren Alpert School of Medicine of Brown University, 222 Richmond Street, Providence, RI 02903, USA
2. Department of Neurosurgery, CHR Citadelle, Bd du 12eme de Ligne, 1, 4000 Liege, Belgium
3. Department of Neurosurgery, Warren Alpert School of Medicine of Brown University, 593 Eddy Street, APC 6, Providence, RI 02903, USA
4. Helios Weißeritztal Clinics, Bürgerstraße 7, 01705 Freital, Germany
5. ORTHix Zentrum für Orthopädie, Stadtberger Str. 21, 86157 Augsburg, Germany
6. Department of Orthopaedics, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China
7. Center for Advanced Spine Care of Southern Arizona, The Surgical Institute of Tucson, 4787 E Camp Lowell Dr, Tucson, AZ 85712, USA