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Adding free to total prostate-specific antigen levels in trials of prostate cancer screening

We used a nested case–control design on data from men in four prospective studies (from the UK, Maryland in the USA, and two from Finland) with available stored serum samples to determine whether there was an ...

N J Wald, H C Watt, L George, P Knekt, K J Helzlsouer… in British Journal of Cancer (2000)