| 1 (704) | National Institute of Public Health, Czech Republic | CZE | |
| 2 (821) | Russian Academy of Medical Sciences | RUS | |
| 3 (981) | I. Mechnikov Research Institute of Vaccines and Sera of the Russian Academy of Medical Sciences | RUS | |
| 4 (984) | Institute of Epidemiology and Microbiology of the Russian Academy of Medical Sciences | RUS | |
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