Ishikawa, Masatoshi
Article History
Received: 24 June 2019
Accepted: 15 October 2019
First Online: 28 October 2019
Ethics approval and consent to participate
: This study was approved by the institutional review board of the Harvard T.H. Chan School of Public Health (No. 18–1422).
: Not applicable.
: The author declares that he has no competing interests