1. Swiss Tropical and Public Health Institute, 4002 Basel, Switzerland
2. University of Basel, 4001 Basel, Switzerland
3. Department of Geography and Environmental Development, Ben-Gurion University of the Negev, P.O. Box 653, Beer Sheva 8410501, Israel
4. Department of Environmental Health, Harvard T. H. Chan School of Public Health, Cambridge, Massachusetts 02115, United States
5. Epidemiology, Biostatistics and Prevention Institute, University of Zurich, 8001 Zurich, Switzerland
6. Department of Epidemiology, Lazio Regional Health Service, 00147 Rome, Italy