1. Institute of Occupational; Social and Environmental Medicine; University Medical Center of the Johannes Gutenberg University of Mainz; Germany
2. Institute of Teachers' Health at the Institute of Occupational; Social and Environmental Medicine; University Medical Center of the Johannes Gutenberg University of Mainz; Germany
3. Institute and Outpatient Clinic for Occupational; Social and Environmental Medicine; Clinical Center; Ludwig-Maximilian University; Munich; Germany
4. Division of Vascular Medicine; Medical Clinic IV; Ludwig-Maximilian University; Munich; Germany
5. Institute of Medical Statistics and Epidemiology; Technical University; Munich; Germany