1. Hellenic Center for Diseases Control and Prevention, Athens, Greece
2. Medical University, Sofia, Bulgaria
3. World Health Organization, Copenhagen, Denmark
4. Institut Pasteur, Paris, France
5. Marmara University, Istanbul, Turkey
6. Utrecht Centre for Tick-borne Diseases, Utrecht University, Utrecht, the Netherlands
7. National Centre of Infectious and Parasitic Diseases, Sofia, Bulgaria
8. Centers of Disease Control and Prevention, Atlanta, United States
9. Robert Koch Institute, Berlin, Germany
10. Central Research Institute of Epidemiology, Moscow, Russian Federation
11. Health Protection Agency, London, United Kingdom
12. European Centre for Disease Control and Prevention, Stockholm, Sweden