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Subjects: CONFIDENCE intervals; CROSS-sectional method; INGESTIONUNITED States
Subjects: EARTH system science; EARTH sciences; SYSTEMS theoryUNITED States
Subjects: ACADEMIC achievement; STATISTICAL correlation; DEMOGRAPHYUNITED States
Subjects: INFLUENZA A virus, H1N1 subtype; FERAL swine; REVERSE transcriptase polymerase chain reactionUNITED StatesUNITED States. Dept. of Agriculture