1. Department of Industrial & Systems Engineering, College of Engineering, University of Washington, Seattle, Washington, USA
2. Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, Washington, USA
3. Department of Epidemiology, School of Public Health, University of Washington, Seattle, Washington, USA
4. Department of Civil & Environmental Engineering, College of Engineering, University of Washington, Seattle, Washington, USA
5. Department of Biostatistics, School of Public Health, University of Washington, Seattle, Washington, USA