Sick population--treated population: the need for a better definition. The VALIDATA Group (Q38477962)

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scientific article published on January 1991
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Sick population--treated population: the need for a better definition. The VALIDATA Group
scientific article published on January 1991

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    Sick population--treated population: the need for a better definition. The VALIDATA Group (English)
    1 January 1991
    267-271

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