1. University of Defence, Faculty of Military Health Sciences, Hradec Kralove, Czech Republic
2. University of Hradec Kralove, Faculty of Science, Hradec Kralove, Czech Republic
3. SUNY Upstate Medical University, Department of Pediatrics, Division of Pediatric Infectious Diseases, Syracuse, NY, USA
4. Charles University, Faculty of Medicine in Hradec Kralove, Department of Social Medicine, Hradec Kralove, Czech Republic