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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 by de Souza Wayner V, Montarroyos Ulisses R, de Albuquerque Maria, Ximenes Ricardo AA, Dantas Odimariles MS, Varejão Patrícia, Rodrigues Laura C

    Published 2007-02-01
    “…When the exposure of interest is offered in a health facility, selection of controls from attenders at the facility may result in over representation of exposure in controls and selection bias.</p>…”
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