1 Department of Health Services, Policy and Practice, Brown University School of Public Health, Providence, RI, USA. Electronic address: Michael_Barton_Laws@Brown.edu.
2 Brown University School of Public Health, Providence, RI, USA; Department of Accident and Emergency, University Teaching Hospital of Kigali, Rwanda.
3 Brown University School of Public Health, Providence, RI, USA.
4 Department of Health Services, Policy and Practice, Brown University School of Public Health, Providence, RI, USA.