Pure Appl. Chem., 1998, Vol. 70, No. 9, pp. 1703-1711
http://dx.doi.org/10.1351/pac199870091703
Bias and confounding in studies of sperm counts
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Pure Appl. Chem., 1998, Vol. 70, No. 9, pp. 1703-1711
http://dx.doi.org/10.1351/pac199870091703