“DIAGNOSTIC ACCURACY OF PROSTATE-SPECIFIC ANTIGEN DENSITY, FREE-TO-TOTAL PSA RATIO, AND DIGITAL RECTAL EXAMINATION IN DETECTING PROSTATE CANCER AMONG MEN WITH SERUM PSA LEVELS IN THE GRAY ZONE (4–10 NG ML): A PROSPECTIVE OBSERVATIONAL STUDY”. Frontier in Medical and Health Research, vol. 4, no. 3, Mar. 2026, pp. 2473-82, https://fmhr.net/index.php/fmhr/article/view/3452.