1 Department of Epidemiology and Biostatics, The University of Arizona, Tucson, AZ; Department of Community, Environment and Policy, The University of Arizona, Tucson, AZ. Electronic address: michellevalenti@arizona.edu.
2 Department of Epidemiology and Biostatics, The University of Arizona, Tucson, AZ; Department of Obstetrics and Gynecology, The University of Arizona, Tucson, AZ.