1. Department of Pediatrics, Division of Perinatal Medicine, University of Colorado Health Sciences Center, Aurora, CO, USA
2. Department of Obstetrics and Gynaecology, Erasmus University Medical Center, Rotterdam, The Netherlands
3. Department of Obstetrics and Gynecology, Division of Perinatal Medicine, University of Colorado, Denver, CO, USA
4. Department of Biomedical Sciences, Colorado State University, Fort Collins, CO, USA