Manfred Wildner1, Lothar H Wieler2, Hajo Zeeb3. 1. Bavarian Health and Food Safety Authority/Pettenkofer School of Public Health, D-85764 Oberschleißheim, Munich, Germany. Electronic address: manfred.wildner@lgl.bayern.de. 2. Robert Koch Institute, Berlin, Germany. 3. Leibniz Institute for Prevention Research and Epidemiology-BIPS, Bremen, Germany.