Funding for this research was provided by:
Health and Labour Sciences Research Grant (H25-Junkankito (Seishuu)-Ippan-018)
Japan Agency for Medical Research and Development (JP15ek0210009)
Received: 29 April 2020
Accepted: 7 February 2021
First Online: 19 February 2021
Ethics approval and consent to participate
: The protocol was approved by the Institutional Review Board of Tokyo Women’s Medical University (4152-R) and the requirement for written informed consent was waived because of the retrospective design.
: Not applicable.
: TS received research funding and lecture fees from Daiichi-Sankyo. MS is a professor in an endowed department that is supported by unrestricted grants from Medtronic, Boston-Scientific, Biotronik, and St Jude Medical. The other authors have no potential conflicts of interest to declare.