Tanaka, Shin-ichiro https://orcid.org/0000-0003-4217-6859
Fujioka, Yoshio
Tsujino, Takeshi
Ishida, Tatsuro
Hirata, Ken-ichi
Article History
Received: 20 March 2018
Accepted: 10 July 2018
First Online: 28 July 2018
Ethics approval and consent to participate
: This study was originally designed as a cross-sectional survey. Therefore, we carefully explained the significance of the follow-up study and only participants who agreed were enrolled in the study. All study protocols were approved by the Medical Ethics Committee of Hidaka Medical Center.
: Not applicable.
: The authors declare that they have no competing interests.
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