Funding for this research was provided by:
Japanese Society for Surgery of the Hand
Received: 22 July 2019
Accepted: 30 December 2019
First Online: 11 January 2020
Ethics approval and consent to participate
: The protocol for this study was reviewed and approved by our Institutional Review Board of Tokyo Medical University Ibaraki Medical Center (No.14–5). Written consent was obtained from all study participants.
: Not applicable.
: The authors declare that they have no competing interests.