Funding for this research was provided by:
Fukushima Medical University (Department grant)
Article History
Received: 15 September 2020
Accepted: 7 March 2021
First Online: 17 March 2021
Declarations
:
: Because a local government database that is saved anonymously was used, the analysis was conducted in such a way that individuals were not identified, and personal information was protected. Based on the retrospective nature of this study, consent was not required from the participants’ families. This study was approved by the Fukushima Medical University Ethics Committee (No.29356) and was carried out in accordance with the ethical principles set forth in the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests in relation to this manuscript.