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Authors
Tokutsu, Akemi
Okada, Yosuke
Torimoto, Keiichi
Tanaka, Yoshiya
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Article History
Received: 27 January 2021
Accepted: 5 April 2021
First Online: 15 April 2021
Declarations
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: 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.
