Funding for this research was provided by:
The Japan Orthopaedics and Traumatology Research Foundation, Inc. (339)
The Japanese Orthopaedic Association
The Promotion Project of Education, Research, and Medical Care from Shinshu University Hospital
The Japanese Society for Musculoskeletal Medicine
The Nakatomi Foundation.
Received: 17 March 2020
Accepted: 29 June 2020
First Online: 3 July 2020
Ethics approval and consent to participate
: The protocols in this study conformed to the ethical guidelines of the 2013 Declaration of Helsinki. Informed consent was obtained from participants prior to the initiation of study. Participants were informed about the purposes of the research both verbally and in writing prior to the study, and written informed consent was obtained from all participants. This study was approved by the institutional review board of Shinshu University Hospital (approval number: 2792).
: Not applicable.
: The authors declare that they have no competing interests.