1. Department of Medical Microbiology, German National Reference Center for Streptococci, Aachen, Germany.
2. BA.Impfstoffe GmbH, Ibbenbüren, Germany.
3. School of Engineering, University of Applied Sciences, Saarbrücken, Germany.
4. Department of Microbiology, University of Kaiserslautern, Kaiserslautern, Germany.