Funding for this research was provided by:
Sichuan University (2018hhs-54)
Health and Family Planning Commission of Sichuan Province (18PJ266)
Department of Science and Technology of Sichuan Province (2018SZ0398)
Received: 12 February 2018
Accepted: 9 August 2018
First Online: 7 November 2018
Ethics approval and consent to participate
: The study protocol was approved by the Ethics Committee of West China Hospital of Sichuan University. Written informed consent was also obtained from respondents during data collection after the purpose of the study was explained. All questionnaires were filled in by respondents anonymously, privacy during interview was also ensured.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.