Funding for this research was provided by:
Centers for Disease Control and Prevention (CCR019817)
Health Resources and Services Administration's Maternal and Child Health Bureau (T76MC00011)
Received: 8 May 2019
Accepted: 28 July 2019
First Online: 12 August 2019
Ethics approval and consent to participate
: This study was approved by the Washington State Institute Review Board (B-100401-H).
: Not applicable.
: The authors declare that they have no competing interests.