[1] Bavarian Hlth & Food Safety Author, Dept Occupat & Environm Hlth Epidemiol, Pfarrstr 3, D-80538 Munich, Germany
[2] Univ Bremen, Inst Publ Hlth & Nursing Res, Dept Social Epidemiol, D-28359 Bremen, Germany
[3] European Commiss, JRC, Ispra, VA, Italy
[4] Univ Erlangen Nurnberg, Dept Biometry & Epidemiol, Erlangen, Germany