1. Department of Epidemiology, Faculty of Medicine, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania
2. National Institute for Infectious Diseases “Prof. Dr. Matei Balș”, Bucharest, Romania
3. Department of Infectious Diseases I, Faculty of Medicine, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania
4. Department of Infectious Diseases, Faculty of Dental Medicine, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania
5. Department of Microbiology, Faculty of Medicine, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania