1 Faculty of Health Sciences, University of Ottawa, Ottawa, ON, Canada. Electronic address: angel.foster@uottawa.ca.
2 Oregon Health & Science University, Portland, OR, USA; OHSU-PSU School of Public Health, Portland, OR, USA; National Institute of Public Health (INSP), Center for Population Health (CISP), Cuernavaca, Morelos, Mexico.
3 Department of Clinical Obstetrics and Gynecology, Keck School of Medicine of the University of Southern California, Los Angeles, CA, USA.
4 Department of Obstetrics and Gynecology, Harbor-UCLA Medical Center, Los Angeles, CA, USA; DuPont Clinic, Washington, DC, USA.
5 Department of Obstetrics and Gynecology, University of North Carolina - Chapel Hill, Chapel Hill, NC, USA.
6 Department of Obstetrics and Gynecology and Mailman School of Public Health, Columbia University, New York, NY, USA.