1. Departamento de Ingeniería, Facultad de Ciencias e Ingeniería, Universidad Peruana Cayetano Heredia, Lima 15102, Perú
2. Department of Civil Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
3. Department of Environmental Microbiology, Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dubendorf, Switzerland
4. Center for Microscopy and Image Analysis, University of Zurich, 8057 Zurich, Switzerland
5. Swiss Tropical and Public Health Institute, 4123 Allschwil, Switzerland
6. University of Basel, 4001 Basel, Switzerland