Selection bias: neighbourhood controls and controls selected from those presenting to a Health Unit in a case control study of efficacy of BCG revaccination.

Dantas, Odimariles MS; Ximenes, Ricardo AA; de Albuquerque, Maria de Fatima PM; Montarroyos, Ulisses R; de Souza, Wayner V; Varejão, Patrícia; Rodrigues, Laura C; (2007) Selection bias: neighbourhood controls and controls selected from those presenting to a Health Unit in a case control study of efficacy of BCG revaccination. BMC medical research methodology, 7 (1). 11-. ISSN 1471-2288 DOI: https://doi.org/10.1186/1471-2288-7-11

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