1. Post-Doctoral Research Assistant, Dept. of Systems Analysis, Integrated Assessment, and Modelling (SIAM), Swiss Federal Institute for Environmental Science and Technology (EAWAG), P.O. Box 611, 8600 Dübendorf, Switzerland (corresponding author).
2. Dept. of Environmental Health Sciences, Arnold School of Public Health, Univ. of South Carolina, Columbia, SC 29208; formerly, Visiting Assistant Professor of Water Resources, Nicholas School of the Environment and Earth Sciences, Duke Univ., PO Box 90328, Durham, NC 27708-0328.
3. Professor of Water Resources, Nicholas School of the Environment and Earth Sciences, Duke Univ., PO Box 90328, Durham, NC 27708-0328.