Text and Data Mining valid from 2019-01-25
Received: 11 October 2018
Accepted: 30 December 2018
First Online: 25 January 2019
Compliance with ethical standards
: The authors declare no conflicts of interest and received no financial support for this study.
: All procedures and subsequent analyses were performed with the approval of the Institutional Review Boards of Mie University Hospital in Japan (No. 2004 − 445). The study was conducted in accordance with the guidelines of the 1975 Declaration of Helsinki.
: Written informed consent was obtained from all study participants.