1. Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, 17475 Greifswald, Germany
2. University of Groningen, University Medical Center Groningen, Department of Medical Microbiology, 9700 RB Groningen, The Netherlands
3. Institute of Bioinformatics, University Medicine Greifswald, 17475 Greifswald, Germany