Marco GA Teli, Department of Orthopaedic Surgery, Civile Regional Hospital, 20025 Legnano (Mi), Italy
Author contributions: Teli MGA designed and wrote the review.
Conflict-of-interest: Marco GA Teli has received fees for serving as a speaker for Alphatec Spine. Biomet Spine and Medtronic.
Open-Access: This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/
Correspondence to: Marco GA Teli, MD, Department of Orthopaedic Surgery, Civile Regional Hospital, via Papa Giovanni Paolo II, 20025 Legnano (Mi), Italy. email@example.com
Telephone: +39-331-449828 Fax: +39-331-449593
Received: February 2, 2015
Peer-review started: February 3, 2015
First decision: April 10, 2015
Revised: May 4, 2015
Accepted: May 5, 2015
Article in press: May 6, 2015
Published online: June 18, 2015