Text and Data Mining valid from 2019-06-20
Received: 27 March 2019
Accepted: 7 June 2019
First Online: 20 June 2019
Compliance with ethical standards
: The authors have 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 Board of Mie University Hospital in Japan (no. 2017-3203). The study was conducted in accordance with the guidelines of the 1975 Declaration of Helsinki. Written informed consent was obtained from all study participants.