1. Department of Epidemiology I, Carol Davila University of Medicine and Pharmacy, 020021 Bucharest, Romania
2. Military Medical Institute, 010919 Bucharest, Romania
3. Emergency Clinical Hospital for Children “Grigore Alexandrescu”, 011743 Bucharest, Romania
4. Department of Epidemiology II, Carol Davila University of Medicine and Pharmacy, 020021 Bucharest, Romania
5. National Centre for Communicable Diseases Surveillance and Control, National Institute of Public Health, 050463 Bucharest, Romania
6. Department of Parasitology, Carol Davila University of Medicine and Pharmacy, 020021 Bucharest, Romania
7. National Institute for Infectious Diseases “Prof. Dr. Matei Balș”, 021105 Bucharest, Romania