1. Chair of General Food Technology, Technische Universität München, Am Forum 2, D-85350 Freising-Weihenstephan, Germany; Bavarian Health and Food Safety Authority, Veterinärstrasse 2, D-85764 Oberschleissheim, Germany; and Cantonal Laboratory Basel City, Kannenfeldstrasse 2, P.O. Box, CH-4012 Basel, Switzerland