Received: 2 June 2021
Accepted: 24 January 2022
First Online: 3 February 2022
: This study was performed according to the principles outlined in the Declaration of Helsinki. The Ethics Committee of Kyoto University Graduate School and Faculty of Medicine approved this study (R2379) and waived the need to obtain informed consent from each patient in the COG. The regional epidemiological study in Kyoto City was also approved by the ethics committee (R2523), and informed consent was obtained from each participant.
: Not applicable.
: All authors declare that they have no competing interests.