Received: 29 April 2020
Accepted: 11 August 2020
First Online: 20 August 2020
Ethics approval and consent to participate
: This study conformed to the provisions of the Declaration of Helsinki, and written informed consent was obtained from all participants. The study was approved by the Syutaikai Hospital Ethical Committee (approval number 2018-09). This protocol was also retrospectively registered with the UMIN Clinical Trials Registry (UMIN000033742).
: Not applicable
: The authors declare that they have no competing interests.