A randomized trial of pelvic radiation therapy versus no further therapy in selected patients with stage IB carcinoma of the cervix after radical hysterectomy and pelvic lymphadenectomy: a gynecologic oncology group study - Sedlis, A; Bundy, B N; Rotman, M Z; Lentz, S S; Muderspach, L I; Zaino, R J (Gynecol Oncol, 1999)