Text and Data Mining valid from 2019-09-18
Received: 28 March 2019
Accepted: 8 September 2019
First Online: 18 September 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The study protocol was approved by Wakayama Medical University Ethical Committee (approval number: 1418) and registered on University Hospital Medical Information Network (UMIN) Clinical Trial Registry (UMIN-CTR, UMIN000022876).
: Written informed consent was obtained from all participants included in this study.