Funding for this research was provided by:
the National Science Foundation of China (72061137006)
Article History
Received: 30 June 2020
Accepted: 14 June 2021
First Online: 2 July 2021
Declarations
:
: Verbal informed consent was obtained from all participants before enrollment. The survey was approved by the Ethics Committee of Maternal and Child Health Hospital of Hubei Province.
: Not applicable.
: We declare that the authors have no potential competing interests. We confirm that the participants and the survey used in our study have not been previously been published elsewhere by any of the authors.