1 University of Colorado School of Medicine, Department of Obstetrics and Gynecology, United States. Electronic address: margo.harrison@cuanschutz.edu.
2 University of Colorado School of Medicine, Department of Obstetrics and Gynecology, United States; University of Colorado School of Public Health, Department of Biostatistics & Informatics, United States.
3 Fundacion Integral por la Salud de los Guatemaltecos, Center for Human Development, Ritalhuleu, Guatemala.
4 University of Colorado School of Medicine, Department of Obstetrics and Gynecology, United States.
5 University of Colorado School of Public Health, Center for Global Health, United States.
6 Denver Health & Hospital Authority Department of Obstetrics & Gynecology, United States.