1. Laboratory of Environmental Chemistry, School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
2. Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland
3. Swiss Tropical and Public Health Institute, CH-4051 Basel, Switzerland
4. University of Basel, CH-4055 Basel, Switzerland