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- narodowy instytut zdrowia publicznego--panstwowy zaklad higieny32
- european centre for disease prevention and control (ecdc)17
- cambridge university press14
- european centre for disease control and prevention (ecdc)13
- elsevier science8
- cambridge university press (cup)7
- springer-verlag7
- elsevier b.v.5
- public library of science (plos)5