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Sasaki, Mitsuharu; Ishidoya, Shigeto; Numahata, Kenji; Arai, Yoichi . (2015). MP60-15 LOW PERCENTAGE OF FREE PROSTATE-SPECIFIC ANTIGEN IS A STRONG PREDICTOR OF LATER DETECTION OF PROSTATE CANCER AMONG MEN WITH SERUM LEVELS OF TOTAL PSA 4.0 NG/ML OR LESS. The Journal of Urology, 193(4), e743–e744. doi:10.1016/j.juro.2015.02.2217 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research