Text and Data Mining valid from 2018-02-17
Received: 16 June 2017
Accepted: 10 February 2018
First Online: 17 February 2018
Compliance with ethical standards
: The study protocol complied with the Helsinki Declaration standards and was approved by the Ethical Committee of our institutions (Approval No. zn161209 at Kobe City Hospital Organization, Kobe City Medical Center General Hospital and No. 16–22 at Foundation for Biomedical Research and Innovation).
: The authors declare that they have no conflict of interest.