1. Environmental and Occupational Health Sciences Institute, Rutgers University, Piscataway, New Jersey, USA
2. International Centre for Indoor Environment and Energy, Department of Civil Engineering, Technical University of Denmark, Lyngby, Denmark
3. Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-Universität Bochum (IPA), Bochum, Germany
4. Department of Material Analysis and Indoor Chemistry, Fraunhofer WKI, Braunschweig, Germany