Christiaan J A van Bergen, Department of Orthopaedic Surgery, Spaarne Gasthuis, 2134 TM Hoofddorp, The Netherlands
Joris P Commandeur, Department of Surgery, Luzerner Kantonsspital, 6000 Luzern, Switzerland
Rik I K Weber, Daniel Haverkamp, Department of Orthopaedic Surgery, Slotervaartziekenhuis, 1066 EC Amsterdam, The Netherlands
Roelf S Breederveld, Department of Trauma Surgery, Red Cross Hospital, 1942 LE Beverwijk, The Netherlands
Author contributions: van Bergen CJA designed and performed the study and wrote the article; Commandeur JP helped perform the study; Weber RIK and Haverkamp D assisted in the analysis; Breederveld RS supervised the study; all authors reviewed and commented on the text and approved the final version.
Institutional review board statement: The study was reviewed and approved by the METC Noord-Holland Institutional Review Board.
Informed consent statement: All study participants provided informed consent prior to study enrolment.
Conflict-of-interest statement: The authors have no conflict of interest to report.
Data sharing statement: The anonymized dataset is available from the corresponding author at firstname.lastname@example.org.
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: Christiaan JA van Bergen, MD, PhD, Orthopaedic Surgeon, Department of Orthopaedic Surgery, Spaarne Gasthuis, Spaarnepoort 1, 2134 TM Hoofddorp, The Netherlands. email@example.com
Telephone: +31-23-2240000 Fax: +31-20-5669117
Received: March 27, 2016
Peer-review started: March 30, 2016
First decision: May 13, 2016
Revised: September 26, 2016
Accepted: October 17, 2016
Article in press: October 19, 2016
Published online: December 18, 2016