Funding for this research was provided by:
Gansu Provincial Hospital (17GSSY9-4)
Received: 23 July 2019
Accepted: 9 June 2020
First Online: 19 June 2020
Ethics approval and consent to participate
: All participants were provided with a plain language statement explaining the study and gave written informed consent in the questionnaire survey. The study was approved by Ethics approval for scientific research of Gansu Provincial Hospital (2018–148).
: Not applicable.
: The authors declare that they have no competing interests.