Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Epidemiology, Munich (Hein-rich J, Wichmann HE, Sausenthaler S, Chen CM, Schnappinger M);Department of Pediatrics, Municipal Hospital ‘St.Georg’, Leipzig(Borte M, Diez U), Marien-Hospital Wesel, Department of Pedi-atrics, Wesel