Effect of digital rectal examination and flexible cystoscopy on free and total prostate-specific antigen, and the percentage of free prostate-specific antigen. Differences between two PSA assays

1. Rodriguez-Rubio, F.I.
2. Robles, J.E.
3. Gonzalez, A.
4. Arocena, J.
5. Sanz, G.
6. Diez-Caballero, F.
7. Martin-Marquina, A.
8. Berian, J.M.