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. 2011 Aug 19;6(8):e23610. doi: 10.1371/journal.pone.0023610

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Query-level estimates are created by applying the GFT methodology to the search activity for a single query. A) ILINet data and GFT estimates based on the query [symptoms of flu]. B) ILINet data and GFT estimates based on the query [symptoms of bronchitis]. C) ILINet data and GFT estimates based on the query [symptoms of pneumonia].