1. Institute for Occupational Safety and Health, German Social Accident Insurance, Sankt Augustin, Germany
2. Julius Wolff Institute, Berlin Institute of Health, Charité—Universitätsmedizin Berlin, Berlin, Germany
3. Institute of Industrial Engineering and Ergonomics, RWTH Aachen, Aachen, Germany
4. Fraunhofer Institute for Communication, Information Processing and Ergonomics FKIE, Aachen, Germany