1. Duke University, Center for Water, Sanitation, Hygiene, and Infectious Disease (WaSH-AID), Durham, North Carolina 27701, United States
2. Department of Electrical & Computer Engineering, Duke University, Durham, North Carolina 27708, United States
3. Department of Civil & Environmental Engineering, University of Illinois at Urbana−Champagne, Urbana, Illinois 61801, United States
4. Department of Civil & Environmental Engineering, Duke University, Durham, North Carolina 27708, United States
5. Cascade Designs, Seattle, Washington 98134, United States