Received: 16 December 2019
Accepted: 6 February 2020
First Online: 21 February 2020
Compliance with ethical standards
: None of the authors has any financial conflicts of interest regarding the present 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 for the use of their information.