1. U.S. Cancer Statistics Working Group. U.S. Cancer Statistics Data Visualizations Tool, based on November 2017 submission data (1999–2015). U.S. Department of Health and Human Services, Institute CfDCaPaNC; 2018.
2. American Cancer Society. What Tests Can Detect Prostate Cancer Early?2016. https://www.cancer.org/cancer/prostate-cancer/early-detection/tests.html.
3. Daily, monthly and seasonal variation in PSA levels and the association with weather parameters;D Connolly;Prostate Cancer And Prostatic Diseases,2010
4. Variation of serum prostate-specific antigen levels: An evaluation of year-to-year fluctuations;JA Eastham;JAMA,2003
5. American Cancer Society. Tests for Prostate Cancer2017. https://www.cancer.org/cancer/prostate-cancer/detection-diagnosis-staging/how-diagnosed.html.