Urakawa, Takaaki
Tanaka, Yuki
Goto, Shinichi
Matsuzawa, Hitoshi
Watanabe, Kei
Endo, Naoto
Article History
Received: 15 February 2018
Revised: 15 June 2018
Accepted: 18 June 2018
First Online: 28 June 2018
Compliance with ethical standards
:
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. For this type of study, formal consent is not required.
: The authors declare that they have no conflicts of interest.