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Alcohol and tobacco consumption are closely correlated and published results on their association with breast cancer have not always allowed adequately for confounding between these exposures. Over(More)
OBJECTIVE To identify factors differentiating men becoming azoospermic from those remaining oligozoospermic within 6 months of T treatment. DESIGN Prospective, open, noncomparative contraceptive(More)
STUDY OBJECTIVES To evaluate the reliability of data supplied in a case-control study by proxy respondents for cases who were too ill to do so themselves. DESIGN A hospital based, case-control(More)