Text and Data Mining valid from 2018-03-07
Received: 10 May 2017
Accepted: 27 February 2018
First Online: 7 March 2018
Compliance with ethical standards
: None of the authors has any financial conflicts of interest regarding the study.
: All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later versions. The Ethics Committee of Kagoshima University and all patients provided written informed consent to the use of their information.