1. Microbiology Unit, Interdisciplinary Biosciences, Belgian Nuclear Research Centre (SCK•CEN), Mol, Belgium;
2. Laboratory of Food Microbiology and Leuven Food Science and Nutrition Research Centre, Department of Microbial and Molecular Systems, Faculty of Bioscience Engineering, KU Leuven, Leuven, Belgium;
3. Laboratoire de Microbiologie et Génétique Moléculaires, Centre national de la recherche scientifique, Toulouse, France