1. Laboratory of Atmospheric Chemistry, Paul Scherrer Institut (PSI), Villigen CH-5232, Switzerland.
2. Institute of Atmospheric Sciences and Climate (ISAC), National Research Council (CNR), Bologna, Italy.
3. Johannes Gutenberg-University of Mainz, Mainz, Germany.
4. Institute of Chemical Technologies and Analytics, Vienna University of Technology, Vienna, Austria.
5. Institute of Anatomy, University of Bern, 3012 Bern, Switzerland.
6. Department of Chemistry and Applied Biosciences, ETH Zürich, Zürich, Switzerland.
7. Division of Pulmonary Medicine, University Hospital, 3010 Bern, Switzerland.