Udomphot, C., B. Lojanapiwat, and J. Jun-U. “PSA Level and Result of Prostate Biopsy in 10 Years in Maharaj Nakorn Chiang Mai Hospital”. Insight Urology, vol. 33, no. 1, June 2012, pp. 9-15, https://he02.tci-thaijo.org/index.php/TJU/article/view/63161.