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2. PRIAS Active Surveillance of Early Prostate Cancer http://www.prias-project.org
3. EAU Guidelines on Prostate Cancer http://www.uroweb.org/gls/pdf/09%20Prostate%20Cancer_LRLV2.pdf
4. Active surveillance in a UK cancer Centre - are patients being put at risk?;Streeter;BJUI Int,2012
5. Medium-term outcomes of active surveillance for localised prostate cancer;Selvadurai;Eur Urol,2013