Authors: Peter Rzehak; Stefanie Sausenthaler; Sibylle Koletzko; Carl Peter Bauer; Beate Schaaf; Andrea von Berg; Dietrich Berdel; Michael Borte; Olf Herbarth; Ursula Krämer; Nora Fenske; H-Erich Wichmann; Joachim Heinrich Journal: Eur J Epidemiol Date: 2009-06-12 Impact factor: 8.082