1. Division of Reproductive Sciences, Department of Obstetrics and Gynecology, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA;
2. Division of Neonatology, Department of Pediatrics, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA; and
3. Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA