1. Institute of Molecular Life Sciences; University of Zurich; Winterthurerstrasse 190 8057 Zurich Switzerland
2. Department of Clinical Microbiology; University of Umea; Umea Sweden
3. Institute for Veterinary Medical Research; Centre for Agricultural Research; Hungarian Academy of Sciences; Budapest Hungary
4. Institut de Génétique Moléculaire de Montpellier; CNRS UMR 5535 Universities of Montpellier I & II Montpellier, France