1. Department of Environmental Health Sciences, University Medical Center Freiburg, Freiburg, Germany
2. Department of Pharmaceutical Biology and Biotechnology, University of Freiburg, Freiburg, Germany
3. Institute of Geosciences, University of Freiburg, Freiburg, Germany
4. Department of Geosciences and FRIMAT, University of Fribourg, Fribourg, Switzerland
5. Departments of Pulmonary Medicine and Clinical Research, Bern University Hospital and University of Bern, Switzerland