(Q30830069)
Statements
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Selection bias: neighbourhood controls and controls selected from those presenting to a Health Unit in a case control study of efficacy of BCG revaccination (English)
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Ulisses R Montarroyos
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Odimariles M S Dantas
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Ricardo A A Ximenes
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Maria de Fatima P M de Albuquerque
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Patrícia Varejão
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23 February 2007
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23 February 2007
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Identifiers
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