1. Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, MA, USA
2. U.S. Department of Transportation, Volpe National Transportation Systems Center, Cambridge, MA, USA
3. Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, MA, USA
4. College of Engineering, Kansas State University, Manhattan, KS, USA
5. Department of Electrical and Computer Engineering, Boise State University, Boise, ID, USA