1. College
of Public Health and Human Sciences, Oregon State University, Milam
20A, Corvallis, Oregon 97331, United States
2. Department
of Earth and Environment, Boston University, Boston, Massachusetts 02215, United States
3. Department
of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia B3H 4J5, Canada
4. Harvard-Smithsonian
Center for Astrophysics, Cambridge, Massachusetts 02138, United States
5. Rollins
School of Public Health, Emory University, Atlanta, Georgia 30322, United States
6. Department
of Civil and Environmental Engineering, University of Washington, Seattle, Washington 98195, United States
7. School
of Population and Public Health, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada