Thomaella Tsouvaltzidou, Eleni Jelastopulu, Department of Public Health, Medical School, University of Patras, 26500 Patras, Greece
Evangelos Alexopoulos, Medical School, University of Athens, 11527 Athens, Greece
Ioannis Fragkakis, Department of Orthopaedic Surgery, General Hospital of Patras “Agios Andreas”, 26335 Patras, Greece
Author contributions: Tsouvaltzidou T and Alexopoulos E contributed equally to this work; Tsouvaltzidou T and Alexopoulos E designed the study; Tsouvaltzidou T and Fragkakis I analyzed and interpretated the data; Tsouvaltzidou T participated in the drafting and reviewing of the manuscript; Alexopoulos E acquired the data; Alexopoulos E and Jelastopulu E participated in the critical revisions of the manuscript for intellectual content; Jelastopulu E contributed in the final approval of the version of the article to be published.
Institutional review board statement: The study was reviewed and approved by the Bioethics Committee of the University of Patras.
Informed consent statement: All study participants provided informed written consent prior to study enrollment.
Conflict-of-interest statement: The authors have no conflict of interest to report.
Data sharing statement: Technical appendix, statistical code and dataset available from the corresponding author at firstname.lastname@example.org. Participants gave informed consent for data sharing.
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: Eleni Jelastopulu, MD, PhD, Professor of Public Health, Department of Public Health, Medical School, University of Patras, Hippokrates Avenue, 26500 Patras, Greece. email@example.com
Telephone: +30-2610-969878 Fax: +30-2610-991606
Received: January 25, 2017
Peer-review started: February 3, 2017
First decision: March 28, 2017
Revised: April 30, 2017
Accepted: May 18, 2017
Article in press: May 19, 2017
Published online: June 18, 2017