Kijima, Tsunetaka http://orcid.org/0000-0002-3892-8459
Akai, Kenju
Matsushita, Akira
Hamano, Tsuyoshi
Onoda, Keiichi
Yano, Shozo
Nabika, Toru
Ishibashi, Yutaka
Kumakura, Shunichi
Article History
Received: 12 June 2018
Accepted: 16 November 2018
First Online: 28 November 2018
Ethics approval and consent to participate
: The Shimane University Institutional Committee on Ethics approved this study (approval number: 2763). Completing and returning a questionnaire after study explanation was considered informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.