Funding for this research was provided by:
Health and Family Planning Commission of Hebei (20180707, 20150072)
Hebei Province Federation of Social Science Circles (201501808)
Text and Data Mining valid from 2018-09-03
Received: 16 April 2018
Accepted: 29 August 2018
First Online: 3 September 2018
Ethics approval and consent to participate
: The Hebei province federation of social science circles approved this study (Permit Number: 201501808). This research was conducted according to the standards of the Declaration of Helsinki. In order to save participants’ time and improve the response rate of participants, the verbal consent was obtained from participants. Obtaining only verbal consent was approved by the ethics committee. The research team explained the purpose of this study to the adults in the communities. After the permission of adults in the communities, on the spot, the researchers guided the community adults how to complete the questionnaires.
: 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.