1. School of the Environment, Yale University, 195 Prospect Street, New Haven, Connecticut 06511, United States
2. Connecticut Agricultural Experiment Station, 123 Huntington Street, New Haven, Connecticut 06504, United States
3. School of Public Health, Yale University, 60 College Street, New Haven, Connecticut 06510, United States
4. Swiss Tropical and Public Health Institute, 2 Kreuzstrasse, Allschwill, Basel 4123, Switzerland