Funding for this research was provided by:
the Sichuan Science and Technology Department Project (No.2018ZR0334)
the Department of Women and Children of the National Health Commission of China
Received: 30 March 2020
Accepted: 7 October 2020
First Online: 15 October 2020
Ethics approval and consent to participate
: The Ethics Committee of West China Second University Hospital, Sichuan University, China, approved this study. All respondents provided verbal informed consent for their anonymized responses to be analyzed and published. The ethics committee approved this method of obtaining verbal consent.
: Not applicable.
: The authors declare that they have no competing interests.