Funding for this research was provided by:
Grant-in-Aid for Scientific Research (JP18K07476)
Received: 8 October 2020
Accepted: 15 December 2020
First Online: 6 January 2021
Ethics approval and consent to participate
: This study complied with the Declaration of Helsinki and was approved by the ethics committee of Keio University Hospital (Approval number: 20190034). Permission to collect and analyze data was given by the bereaved family by opt-outs in this chart-based retrospective study.
: Not applicable.
: MM has received grants and/or speaker’s honoraria from sixteen pharmaceutical companies within the past three years but he has no financial or any other kind of personal conflicts with this paper. Other authors do not report any conflict of interest.