1. Department of Obstetrics and Gynecology, University of Tennessee Health Science Center, Memphis, TN, USA
2. Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, TN, USA
3. Department of Obstetrics and Gynecology, Inova Health System, VA, USA
4. Florida Woman Care of Indian River County, Vero Beach, FL, USA
5. Perinatal Associates of Northern Virginia, Fairfax, VA, USA