1 Center For Global Safe Water, Rollins School of Public Health, Emory University, Atlanta, GA, USA.
2 Department of Biostatistics, Jiann-Ping Hsu College of Public Health, Georgia Southern University, Statesboro, GA, USA.
3 Department of Epidemiology, Jiann-Ping Hsu College of Public Health, Georgia Southern University, Statesboro, GA, USA.
4 Water Supply and Sanitation Collaborative Council, Geneva, Switzerland.
5 Department of Occupational and Environmental Health, College of Public Health, The University of Iowa, Iowa City, IA, USA. Electronic address: kelly-k-baker@uiowa.edu.