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

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Risk factors for treatment delay in pulmonary tuberculosis in Recife, Brazil by Dantas Odimariles MS, Campelo Antônio RL, Braga Cynthia, Lucena-Silva Norma LCL, Ximenes Ricardo AA, Albuquerque Maria FPM, dos Santos Martinho APS, Montarroyos Ulisses R, Souza Wayner V, Kawasaki Alexandre M, Rodrigues Laura C

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