Received: 15 December 2020
Accepted: 28 November 2021
First Online: 19 December 2021
: The respondents were voluntary and written informed consent was obtained from all the respondents. All study procedures were approved by the ethics committee of the National Health Research Institute in Taiwan on July 24, 2013 (Code: EC1020502).
: Not applicable.
: The authors have no conflicts of interest to declare that are relevant to the content of this article.