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Authors
Ochi, Sae http://orcid.org/0000-0003-4133-3170
Saito, Kazuyoshi
Mizoguchi, Fumitaka
Kato, Shigeaki
Tanaka, Yoshiya
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Article History
Received: 26 September 2019
Accepted: 6 February 2020
First Online: 4 March 2020
Ethics approval and consent to participate
: This study complies with the Declaration of Helsinki and the institutional review board of the University of Occupation and Environmental Health approved the study. Informed consent was obtained from all participants of the FIRST study.
: Not applicable
: The authors declare that they have no competing interests.
