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Authors
Motoya, Takumi
Umezawa, Masahiro
Saito, Aoi
Goto, Keiko
Doi, Ikuko
Fukaya, Setsuko
Nagata, Noriko
Ikeda, Yoshiaki
Okayama, Kaori
Aso, Jumpei
Matsushima, Yuki
Ishioka, Taisei
Ryo, Akihide
Sasaki, Nobuya
Katayama, Kazuhiko
Kimura, Hirokazu
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Article History
Received: 28 November 2018
Accepted: 2 May 2019
First Online: 24 May 2019
Ethics approval and consent to participate
: The study protocol was approved by Ibaraki Prefecture Epidemiological Research Joint Ethics Review Committee, Ibaraki, Japan (Approval Number: H30-1).
: The authors declare that they have no competing interests.
