Funding for this research was provided by:
National Center on Birth Defects and Developmental Disabilities (U01 DD 001179)
Health Resources and Services Administration (Title V Maternal and Child Health Block Grant)
Received: 7 November 2018
Accepted: 26 March 2019
First Online: 5 April 2019
Ethics approval and consent to participate
: This study was approved by the University of Texas Health Science Center at Houston Committee for the Protection of Human Subjects (HSC-SPH-11-0109) and the Texas Department of State Health Services Institutional Review Board (14033). The requirement to obtain informed consent was waived for this study.
: Not applicable.
: The authors declare that they have no competing interests.
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