Hayashi, Shinya
Hashimoto, Shingo
Matsumoto, Tomoyuki
Takayama, Koji
Shibanuma, Nao
Ishida, Kazunari
Nishida, Kotaro
Kuroda, Ryosuke
Article History
Received: 19 December 2017
Accepted: 16 March 2018
First Online: 26 March 2018
Compliance with ethical standards
: The study protocol was approved by our institutional ethics committee on September 8, 2011 (No. 1219), and informed consent for participation in the study was obtained from all participants.
: The authors declare that they have no conflict of interest.