1. Department of Family Practice, Midwifery Program, University of British Columbia, Vancouver, Canada.
2. School of Nursing, University of California, San Francisco, California, USA.
3. National Birth Equity Collaborative, New Orleans, Louisiana, USA.
4. Department of Obstetrics, Gynecology and Reproductive Sciences, University of California, San Francisco, California, USA.
5. Rory Meyers College of Nursing, New York University, New York, New York, USA.
6. Geography and Geographic Information Science, University of Illinois, Urbana, Illinois, USA.