Funding for this research was provided by:
National Institute of Child Health and Human Development (U10HD076465)
Received: 28 August 2020
Accepted: 2 September 2020
First Online: 17 December 2020
Ethics approval and consent to participate
: At each site, institutional review boards or ethics committess approved the study. All women provided written informed consent before the start.
: Not applicable.
: The authors declare that they have no competing interests.