Funding for this research was provided by:
JSPS KAKENHI (18K08632.)
Received: 19 January 2022
Accepted: 23 March 2022
First Online: 28 March 2022
: This study was approved by the institutional review board of Tokyo Women’s Medical University (Ethics Committee of Tokyo Women’s Medical University, acceptance number 3839). All methods were performed in accordance with the relevant guidelines and regulations (For example: Declarations of Helsinki) by including a statement in the Ethics approval and consent to participate section to this effect. The requirement for informed consent was waived by the Ethics Committee of Tokyo Women’s Medical University because of the retrospective nature of the study.
: Not applicable. This article does not contain any personally identifiable data.
: The authors declare no competing interests.