Funding for this research was provided by:
Fundamental Research Project of Medical Health in Bao'an District (2018JD174)
Received: 24 February 2020
Accepted: 8 September 2020
First Online: 18 September 2020
Ethics approval and consent to participate
: SPPCS was approved by the research ethics review committee of the Shenzhen Center for Chronic Disease Control and Prevention. Pregnant women and their male partners were informed of the purpose and details of SPPCS by the doctor and signed an informed consent before participating SPPCS. For data use of the SPPCS for the current study, we obtained an additional ethical review and approval from the committee (approval number 2016NL021). Participants’ names, initials, phone numbers and hospital admission numbers did not appear in the text or in illustrative material.
: Not applicable.
: The authors declare that they have no competing interests.