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- elsevier b.v.35
- elsevier bv24
- elsevier/north-holland biomedical press14
- american society for microbiology7
- centers for disease control & prevention (cdc)6
- public library of science6
- elsevier scientific pub. co4
- centers for disease control and prevention (cdc)3
- national center for infectious diseases, centers for disease control and prevention (cdc)3