Funding for this research was provided by:
Japan Society for the Promotion of Science (KAKENHI 19H01164)
Fukushima Innovation Coast Framework Organization (NA)
Text and Data Mining valid from 2020-05-08
Received: 9 February 2020
Accepted: 1 May 2020
First Online: 8 May 2020
Ethics approval and consent to participate
: This study protocol was approved by the ethical review board of the Graduate School of Medicine at Kyoto University (approval number R0869, 12 December 2016). Japanese ethical guidelines provide for the waiver of informed consent for research use of existing medical records after anonymization. Access to Japanese National Healthcare System data for Kawauchi Village was obtained with permission from the Mayor of Kawauchi village.
: Not applicable in this study.
: The authors declare that they have no competing interests.