Funding for this research was provided by:
the Food Safety Commision, Cabinet Office, Government of Japan (1904, 1503)
Text and Data Mining valid from 2020-02-21
Received: 17 October 2019
Accepted: 17 February 2020
First Online: 21 February 2020
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of the National Cancer Center, Tokyo, Japan, and all other collaborating research institutions. The study was also approved by the ethics committee of Azabu University (approval number 2457). This study was conducted in accordance with the ethical standards of the 1964 Declaration of Helsinki and its later amendments. All participants provided informed consent.
: Consent for publication was obtained from all participants.
: The authors declare that they have no competing interests.