1. Department of Medical Microbiology; Leiden University Medical Center; Postzone E4-P, P.O. Box 9600 NL-2300 RC Leiden The Netherlands
2. Faculty of Bioengineering and Bioinformatics; M. V. Lomonosov Moscow State University; Moscow 119899 Russia
3. Department of Medical Microbiology; Leiden University Medical Center, Postzone E4-P; P.O. Box 9600 NL-2300 RC Leiden The Netherlands