1. a The Water Institute at UNC, Department of Environmental Sciences and Engineering, The Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 4114 McGavran Hall, Campus Box # 7431, Chapel Hill, NC 27599, USA
2. b ICF, 2635 Meridian Parkway Suite 200, Durham, NC 27713, USA
3. c World Vision, 300 St NE, Washington, DC 20002, USA