Funding for this research was provided by:
Health Commission of Chaoyang district
Science Technology & Information Bureau of Chaoyang district
Received: 6 July 2020
Accepted: 3 September 2020
First Online: 10 September 2020
Ethics approval and consent to participate
: Ethical approval for this research was granted by the China-Japan Friendship Hospital Human Ethics Committee. The participants were only able to be interviewed after accepting the terms of consent.
: Not applicable.
: The authors declare that they have no competing interests.