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Exposure to persons with symptoms of respiratory or gastrointestinal infection and relative risk of disease: self-reported observations by controls in a randomized intervention trial

Crossref DOI link: https://doi.org/10.1186/s13063-015-0691-4

Published Online: 2015-04-17

Published Print: 2015-12

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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