Text and Data Mining valid from 2018-05-23
Received: 14 April 2018
Accepted: 7 May 2018
First Online: 23 May 2018
Compliance with ethical standards
: The authors have no conflicts of interest and sources of funding to declare.
: This study was approved by the University Hospital Ethics Committee (The Jikei University School of Medicine, Reference number 25-320 7455).
: Informed consent was obtained from all participants before enrollment of this study.