Funding for this research was provided by:
Kaohsiung Medical University Chung-Ho Memorial Hospital (KMUH103-3M47)
Received: 26 December 2019
Accepted: 29 April 2020
First Online: 27 May 2020
Ethics approval and consent to participate
: This study protocol was approved by the Institutional Review Board of Kaohsiung Medical University Hospital, Taiwan (KMUHIRB-SV-20150003(I)). The content was explained in Chinese. All participants gave written informed consent before enrollment in this study.
: Not applicable.
: The authors declare that they have no competing interests.