1. Directorate of Occupational Safety and Health, German Social Accident Insurance Institution for Commercial Transport, Postal Logistics and Telecommunication (Berufsgenossenschaft Verkehrswirtschaft Post-Logistik Telekommunikation), Ottenser Hauptstraße 54, 22765 Hamburg, Germany Tel.: +49 40 3930 1961, E-mail: eva.winkler@bg-verkehr.de.