Received: 19 July 2021
Accepted: 27 August 2021
First Online: 12 September 2021
: All procedures involving human participants were in accordance with the ethical standards of the 1964 Helsinki Declaration and its later amendments. This study was conducted with approval from the ethics committees of Tokyo Women’s Medical University (approval no.4578, December 12, 2017). Informed consent was obtained via an opt-out procedure.
: Not applicable.
: K.O. received speaker’s fees from Smith and Nephew, Inc. and Zimmer-Biomet. The other authors declare that they have no competing interests.