[1] Bavarian Hlth & Food Safety Author, Dept Environm Hlth, D-85764 Oberschleissheim, Germany
[2] Univ Ulm, Dept Epidemiol, Ulm, Germany
[3] GSF Natl Res Ctr Environm & Hlth, Inst Epidemiol, Neuherberg, Germany
[4] Publ Hlth Serv Gelderland Midden, Arnhem, Netherlands
[5] Univ London, Queen Marys Sch Med & Dent, Ctr Psychiat, London, England