Don Koh, Lincoln Liow, Joseph Cheah, Kevin Koo, Department of Orthopaedic Surgery, Singapore General Hospital, Singapore 169856, Singapore
Author contributions: All authors designed, performed the research and analyzed the data; Koh D wrote the paper.
Informed consent statement: All study participants, or their legal guardian, provided informed written consent prior to study enrollment
Conflict-of-interest statement: All authors have seen and agree with the contents of the manuscript and there is no financial interest to report.
CARE Checklist (2016) statement: The authors have read the CARE Checklist (2016), and the manuscript was prepared and revised according to the CARE Checklist (2016).
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/
Corresponding author: Don Koh, BSc, MBBS, Doctor, Department of Orthopaedic Surgery, Singapore General Hospital, 20 College Road, Academia Building Level 4, Singapore 169856, Singapore. firstname.lastname@example.org
Telephone: +65-62223322 Fax: +65-62248100
Received: November 14, 2018
Peer-review started: November 14, 2018
First decision: November 29, 2018
Revised: December 14, 2018
Accepted: December 31, 2018
Article in press: January 1, 2019
Published online: January 18, 2019