Received: 16 June 2020
Accepted: 26 October 2020
First Online: 12 November 2020
Ethics approval and consent to participate
: As described in the text, the present study was performed in accordance with the Declaration of Helsinki, and the study protocol was approved by the Ethics Committees of the Osaka International Cancer Institute (Osaka, Japan) (formerly the Osaka Medical Center for Cancer and Cardiovascular Diseases) (1404015008) and the Kochi University School of Medicine (Kochi, Japan) (ERB-000486). All participants gave their written informed consent for inclusion in this study.
: HY and SK are employees of Ajinomoto Co., Inc. (Kanagawa, Japan). MH and TA have received research grants from Ajinomoto Co., Inc. (Kanagawa, Japan). This does not alter the authors’ adherence to journal’s policies. The remaining authors declare that they have no competing interests.