(Q67841313)
Statements
A new influenza surveillance system in France: the Ile-de-France "GROG". 2. Validity of indicators (1984-1989) (English)
A new influenza surveillance system in France: The Ile-De-France ?GROG?. 2. Validity of indicators (1984?1989) (English)
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W. Dab
P. Quenel
J. M. Cohen
1 November 1991
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