Liang, Xianhong
Carroll, Xianming http://orcid.org/0000-0002-5030-0269
Zhang, Wenyan
Zhang, Wenjing
Liu, Gaifen
Li, Shangzhi
Leeper-Woodford, Sandra
Funding for this research was provided by:
Beijing Chaoyang District Science and Technology Development Plan (SF1216)
Article History
Received: 21 April 2018
Accepted: 23 November 2018
First Online: 6 December 2018
Ethics approval and consent to participate
: Ethical approval was obtained from Institutional Review Boards of Beijing Chaoyang District Hospital of Maternal and Child Health and Beijing Chuiyangliu Hospital. Participants were informed about the confidentiality of information and it was maintained by excluding personal identifiers from the data collection form. Written informed consent was obtained from every study participants before data collection. Participants were informed that participation was voluntary and as it was their right not to participate or withdraw at any time if they were not comfortable.
: Not applicable.
: The authors declare that they have no competing interests.
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