1 Department of Obstetrics and Gynecology, University of Colorado School of Medicine, 12631 E. 17th Avenue, Mail Stop B198-2, Aurora, CO 80045, USA. Electronic address: Jeanelle.Sheeder@ucdenver.edu.
2 Prevention Research Center for Family and Child Health, University of Colorado School of Medicine, Mail Stop 8410, 13121 E. 17th Avenue, Room 5319, Aurora, CO 80045, USA.