1. Department of Epidemiology and
2. Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, Michigan, USA
3. Department of Atmospheric Sciences, School of Engineering, University of Michigan, Ann Arbor, Michigan, USA
4. Departments of Medicine and Epidemiology, Columbia University Medical Center, New York, New York, USA
5. Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
6. Department of Public Health Sciences, School of Medicine, Wake Forest University, Winston-Salem, North Carolina, USA
7. Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, Washington, USA