1. Institute of Microbiology; Technical University Braunschweig; Braunschweig Germany
2. Athena Institute; Vrije Universiteit Amsterdam; Amsterdam The Netherlands
3. Division of Animal and Human Health Engineering; Department of Biosystems; Katholieke Universiteit Leuven; Leuven Belgium
4. Department of Microbial Biotechnology; Centro Nacional de Biotecnología; Consejo Superior de Investigaciones Científicas; Madrid Spain