Usui, Yoshiko
Ono, Shigeru
Baba, Katsuhisa
Tsuji, Yuki
Article History
Accepted: 31 July 2018
First Online: 11 August 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study was approved by the ethics committee of Jichi Medical University and has, therefore, been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments.