Tsukamoto, Masanori
Yamanaka, Hitoshi
Yokoyama, Takeshi
Article History
Received: 15 August 2017
Accepted: 26 February 2018
First Online: 3 March 2018
Compliance with ethical standards
:
: We have no conflict of interest.
: The Ethic Review Board of Kyushu University Hospital approved a retrospective study.
: For this kind of study informed consent is not rquired.