1. Department of Microbiology and Biotechnology University of Hamburg Hamburg Germany
2. Department of Microbiology RIBES, Radboud University Nijmegen The Netherlands
3. Department of Ecology and Environmental Science and Research Infrastructure Fluorescence in situ Hybridization (FISH) Chemical Biological Centre, Umeå University Umeå Sweden
4. Department of Microbiology Technical University of Munich Freising Germany