1. Department of Occupational and Environmental Medicine and Epidemiology, Bavarian Health and Food Safety Authority, Munich, Germany,
2. Bavarian Health and Food Safety Authority, Centre for Early Cancer Detection and Cancer Registration, Nuremberg, Germany,
3. Bavarian Health and Food Safety Authority, Centre of Prevention and Health Promotion, Munich, Germany,
4. Department of Otorhinolaryngology, University Hospital Regensburg, Regensburg, Germany,
5. Department of Social Epidemiology, University of Bremen, Institute of Public Health and Nursing Research, Bremen, Germany, and
6. Department of Toxicology and Chemical Safety, Bavarian Health and Food Safety Authority, Munich, Germany