Article History
Received: 14 October 2020
Accepted: 16 March 2021
First Online: 21 April 2021
Declarations
:
: The authors declare no competing interests.
: The protocols for this study were approved by the local ethics committee of the Tokyo Medical and Dental University (M2018-308).
: Since this study was a retrospective observational study, written informed consent was not obtained from the patients, and requirement for informed consent was waived by the institutional review board. However, we gave patients an opportunity to opt out of the study.