Tokutsu, Akemi
Okada, Yosuke
Torimoto, Keiichi
Tanaka, Yoshiya
Article History
Received: 10 June 2020
Accepted: 5 August 2020
First Online: 12 August 2020
Ethics approval and consent to participate
: The study protocol and opt-out method of informed consent were approved by the ethics committee of the University of Occupational and Environmental Health (Trial registration: H27-186, Registered 25 Dec 2015).
: Not applicable.
: The authors declare that they have no competing interests.