1. Department of Neurology and Center for Circadian and Sleep Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL;
2. Department of Obstetrics and Gynecology, Magee-Womens Research Institute & Foundation, University of Pittsburgh School of Medicine, Pittsburgh, PA;
3. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Northwestern University Feinberg School of Medicine, Chicago, IL;
4. RTI International, Research Triangle Park, NC;
5. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of Utah Health Sciences Center, Salt Lake City, UT;
6. Department of Clinical Medicine, College of Physicians and Surgeons, Columbia University, New York, NY;
7. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, TX;
8. Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD;
9. Indiana University Health Sleep Disorders Center, Indiana University School of Medicine, Indianapolis, IN;
10. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Case Western Reserve University School of Medicine, Cleveland, OH;
11. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, College of Physicians and Surgeons, Columbia University, New York, NY;
12. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of California, Irvine, School of Medicine, Irvine, CA;
13. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Indiana University School of Medicine, Indianapolis, IN;
14. Department of Obstetrics and Gynecology, Ohio State University, Columbus, OH;
15. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of Pennsylvania School of Medicine, Philadelphia, PA.