Funding for this research was provided by:
Health Department of Sichuan Province (18PJ585, 2018-228)
Received: 6 February 2020
Accepted: 30 September 2020
First Online: 6 October 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Committee at of Sichuan Provincial People's Hospital(Approval Number: 2017-153), China. All participants were informed about the study and gave formal consents before being interviewed.
: The authors agree to publish in this journal.
: The authors declare no conflicts of interest. This study is not related to any particular products of a company, and the results do not recommend any particular products.