Document is current
Any future updates will be listed below
-
Authors
Fan, S. L.
Xiao, C. N.
Zhang, Y. K.
Li, Y. L.
Wang, X. L.
- License Information
-
More Information
Article History
Received: 23 September 2019
Accepted: 28 April 2020
First Online: 27 May 2020
Ethics approval and consent to participate
: All participants consented in writing to participation, and the above protocols were approved by the ethics committee of Hebei Women and Children’s Health Center.
: Not Applicable.
: The authors declare that they have no competing interest.
