Funding for this research was provided by:
Ministry of Health, Labour and Welfare (H24-Kenki-Shitei-002, H25-Kenki-Shitei-002 (Fukko))
International Research Institute of Disaster Science, Tohoku University (an Intramural Research Grant for Special Project Research)
Core Research Cluster of Disaster Science, Tohoku University (an Intramural Research Grant)
Text and Data Mining valid from 2019-08-27
Received: 6 February 2019
Accepted: 19 August 2019
First Online: 27 August 2019
Ethics approval and consent to participate
: The research protocol was approved by the Ethics Committee of the Internal Research Institute of Disaster Science, Tohoku University. The participants answered an open-ended questionnaire after providing written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.