1. The Mel and Enid Zuckerman College of Public Health, Department of Epidemiology and Biostatistics, The University of Arizona, Tucson, Arizona;
2. Johns Hopkins Bloomberg School of Public Health, Johns Hopkins Center for Injury Research and Policy, Baltimore, Maryland;
3. The Mel and Enid Zuckerman College of Public Health, Department of Community Environment and Policy, The University of Arizona, Tucson, Arizona;
4. Department of Ophthalmology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois;
5. Feinberg School of Medicine, Center for Healthcare Studies, Northwestern University, Chicago, Illinois;
6. Veterans Affairs Health Services Research and Development Service, Chicago, Illinois;
7. Seattle Fire Department, Seattle, Washington