Funding for this research was provided by:
Japan Agency for Medical Research and Development (JP18km0105002, JP18km0105001)
Received: 8 September 2018
Accepted: 23 July 2019
First Online: 2 August 2019
Ethics approval and consent to participate
: The study was approved by the Research Ethics Committee of Tohoku Medical Megabank Organization, Tohoku University. The researchers informed ToMMo GMRC to voluntarily participate the study in the cover letter of the questionnaire and returning the completed questionnaire constituted implied consent to participate. This consent procedure was clearly written in the study protocol and approved by the committee.
: Not applicable.
: The authors declare that they have no competing interests.