1. Institute of Environmental Engineering, Department of Civil, Environmental and Geomatic Engineering, ETH Zurich, CH-8093 Zurich, Switzerland
2. Institute of Food, Nutrition and Health, Department of Health Sciences and Technology, ETH Zurich, 8092 Zurich, Switzerland
3. Institute of Medical Microbiology, Faculty of Medicine, University of Zurich, CH-8032 Zurich, Switzerland
4. Department of Life Sciences, Albstadt-Sigmaringen University, 72488 Sigmaringen, Germany