W, A., K, B., C, N., L, S. and R, P. (2006) “Cut Off Point of Percentage of Free PSA that Optimize for Prostate Cancer Detection”, Insight Urology, 27(2), pp. 73–80. available at: https://he02.tci-thaijo.org/index.php/TJU/article/view/253540 (accessed: 19 September 2026).