Funding for this research was provided by:
Grants-in-aid for scientific research from the Japanese Ministry of Education, Culture, Sports, Science, and Technology (20K09369, 20K09389)
Received: 10 June 2021
Accepted: 11 September 2021
First Online: 22 September 2021
: All authors declare that they have no conflict of interest.
: The study was approved by the institutional review board (protocol number B190100) and conducted according to institutional and national ethical guidelines and in accordance with the Helsinki Declaration.
: Patient informed consents were waived by the institutional review board due to the retrospective nature of the study and use of anonymized data.
: Not applicable.