Postoperative surveillance protocol for patients with localized and locally advanced renal cell carcinoma based on a validated prognostic nomogram and risk group stratification system: Lam JS, Shvarts O, Leppert JT, Pantuck AJ, Figlin RA, Belldegrun AS, Division of Urologic Oncology, the Department of Urology, David Geffen School of Medicine at University of California-Los Angeles, Los Angeles, CA