1. University of Groningen, University Medical Center Groningen, Department of Medical Microbiology, Groningen, the Netherlands
2. University of Greifswald, Institute of Microbiology, Department of Microbial Proteomics, Greifswald, Germany
3. University of Groningen, Groningen Biomolecular Sciences and Biotechnology Institute, Department of Molecular Genetics, Groningen, the Netherlands
4. University of Groningen, University Medical Center Groningen, Department of Rheumatology and Clinical Immunology, Groningen, the Netherlands