Rudra Narayan Mukherjee, Hira Lal Nag, Ravi Mittal, Department of Orthopaedics, All India Institute of Medical Sciences, New Delhi 110029, India
R M Pandey, Department of Biostatistics, All India Institute of Medical Sciences, New Delhi 110029, India
Author contributions: Mukherjee RN, Nag HL and Mittal R planned and conducted this study; Pandey RM helped with the biostatistics for this study; Mukherjee RN and Mittal R wrote this article.
Institutional review board statement: The ethics committee of All India Institute of Medical Sciences, New Delhi, approved the study.
Informed consent statement: All the patients were informed about the study before including them in the study. The informed consent was explained to them in their native language and a written consent was obtained as advised by the ethic committee of our institute. The identity of any of the patients was not disclosed.
Conflict-of-interest statement: All authors declare no conflict of interest related to this paper.
Data sharing statement: No additional data are available.
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: Dr. Ravi Mittal, Professor, Department of Orthopaedics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi 110029, India. firstname.lastname@example.org
Telephone: +91-11-26594993 Fax: +91-11-26588663
Received: October 12, 2016
Peer-review started: October 15, 2016
First decision: December 15, 2016
Revised: January 26, 2017
Accepted: February 18, 2017
Article in press: February 20, 2017
Published online: May 18, 2017