Ohnuma, Hiroyuki https://orcid.org/0000-0002-4350-6971
Sato, Yasushi
Hirakawa, Masahiro
Kikuchi, Shohei
Miyanishi, Koji
Sagawa, Tamotsu
Takahashi, Yasuo
Nobuoka, Takayuki
Okamoto, Koichi
Miyamoto, Hiroshi
Takemasa, Ichiro
Takayama, Tetsuji
Kato, Junji
Article History
Received: 1 September 2017
Accepted: 16 January 2018
First Online: 30 January 2018
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: None.
: This study was approved by the ethics committee of each participating hospital and was performed in accordance with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: For this type of study formal consent is not required.