1. Department of Biostatistics, Center for Statistical Sciences, Brown University School of Public Health, Providence, RI, USA
2. Department of Emergency Medicine, Alpert Medical School, Brown University, Providence, RI, USA
3. Department of Epidemiology, Brown University, School of Public Health, Providence, RI, USA
4. Department of Quantitative Health Sciences and Center for Health Policy and Research, University of Massachusetts Medical School, Worcester, MA, USA
5. Department of Biobehavioral Health, Pennsylvania State University, University Park, PA, USA
6. Department of Family and Community Health, School of Nursing, University of Pennsylvania, Philadelphia, PA, USA
7. Fenway Community Health, Boston, MA, USA