Groin dissection versus groin radiation in carcinoma of the vulva: a Gynecologic Oncology Group study. - Stehman,F.B.; Bundy,B.N.; Thomas,G.; Varia,M.; Okagaki,T.; Roberts,J.; Bell,J.; Heller,P.B. (Int J Radiat Oncol Biol Phys, 1992)