Hisatoshi Ishikura, Takeyuki Tanaka, Sakae Tanaka, Department of Orthopedic Surgery, University of Tokyo, Tokyo 113-8655, Bunkyo-ku, Japan
Naoshi Fukui, Mitsuyasu Iwasawa, Satoru Ohashi, Department of Orthopedic Surgery, National Hospital Organization, Sagamihara Hospital, Sagamihara 252-0392, Kanagawa Prefecture, Japan
Author contributions: Ishikura H wrote the paper; Fukui N, Iwasawa M, Ohashi S, Tanaka T and Tanaka S collected the previous reports; all authors made the revisions for the first draft and also approved the final version of the manuscript.
Conflict-of-interest statement: The authors declare that they have no conflict of interest.
: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (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: Hisatoshi Ishikura, MD, Doctor, Department of Orthopedic Surgery, University of Tokyo, 7-3-1 Hongo, Tokyo 113-8655, Bunkyo-ku, Japan. firstname.lastname@example.org
Received: January 2, 2021
Peer-review started: January 2, 2021
First decision: January 18, 2021
Revised: January 27, 2021
Accepted: March 8, 2021
Article in press: March 8, 2021
Published online: April 18, 2021