1 Department of Obstetrics and Gynecology, University of Virginia School of Medicine, Charlottesville, VA, USA.
2 Department of Obstetrics and Gynecology, Weill Cornell Medicine, New York, NY, USA.
3 Laboratory of Investigative Medicine and Virology, Institute of Tropical Medicine, Faculty of Medicine of the University of Sao Paulo, Sao Paulo, SP, Brazil.
4 University Clinic of Obstetrics and Gynaecology, Medical University of Vienna, Vienna, Austria.
5 Department of Women's and Children's Health, North Bristol NHS Trust, Southmead Hospital, Bristol, UK.
6 Department of Obstetrics and Gynecology, University of North Carolina School of Medicine, Chapel Hill, NC, USA.