1. Technical University of Denmark; Lyngby Denmark
2. Missouri University of Science and Technology; Rolla MO USA
3. Environmental and Occupational Health Sciences Institute; Rutgers University; Piscataway NJ USA
4. Institute for Prevention and Occupational Medicine of the German Social Accident Insurance; Institute of the Ruhr-Universität Bochum (IPA); Bochum Germany
5. Fraunhofer WKI; Braunschweig Germany