1. Community Health Program, Tufts University, 112 Packard Avenue, Medford, MA 02155, USA
2. Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Rosenau Hall, Chapel Hill, NC 27599, USA
3. Department of Civil and Environmental Engineering, Tufts University, 200 College Avenue, Medford, MA 02155, USA
4. Noguchi Memorial Institute for Medical Research (NMIMR), University Ghana, College of Health Sciences, University of Ghana, P.O. Box LG 581, Legon, Ghana
5. P.O. Box 399, Teshie-Accra, Ghana