Erratum to: Eur Spine J DOI 10.1007/s00586-015-4032-9

The authors want to add for Dr. Wang his general disclosures:

Financial activities outside the submitted work: Royalties—Stryker, Osprey, Biomet, Synthes, Seaspine, Amedica, Aesculap.

Investments/Options: Bon Biologics, Alphatech, Axiomed, Amedica, Corespine, Expanding Ortho, Pioneer, Axis, Syndicom, VG Innovations, Pearldiver, Flexuspine, Fziomed, Benvenue, Promethean, Nexgen, Electrocore, Surgitech.

Board of Directors: AO Spine, Collaborative Spine Research Foundation, North American Spine Society, Cervical Spine Research Society.

Fellowship Funding: AO Spine North America.

Editorial Boards: Spine, JAAOS, The Spine Journal, Journal of Spinal Disorders and Techniques, Global Spine Journal, The Journal of Orthopaedic Trauma.