Funding for this research was provided by:
Ministry of Health, Labour and Welfare (H25-KENKI-SHITEI-001, H25-SEISHIN-IPPAN-006)
Ministry of the Environment (the Study of the Health Effects of Radiation)
Tohoku University (the Special Project Research of the Tohoku University International Research Institute for Disaster Science 2014)
Received: 20 December 2019
Accepted: 12 August 2020
First Online: 20 August 2020
Ethics approval and consent to participate
: The Committees of Ethics in Research of Human Subjects of the Graduate School of Medicine of The University of Tokyo approved the study protocol and informed consent procedure (No. 10131-(7)). Written consent was obtained from each respondent. Participation was voluntary, and participants were assured of anonymity and confidentiality. The authors assert that all procedures contributing to this work comply with the ethical standards of the relevant national and institutional committees on human experimentation and with the Helsinki Declaration of 1975, as revised in 2008.
: Not applicable.
: The authors declare that they have no competing interests.