Complete Surgical Excision Is Effective Treatment for Children with Immature Teratomas with or without Malignant Elements: A Pediatric Oncology Group/Children’s Cancer Group Intergroup Study - Marina, NM; Cushing, B; Giller, R; Cohen, L; Lauer, SJ; Ablin, A; Weetman, R; Cullen, J; Rogers, P; Vinocur, C; Stolar, C; Rescorla, F; Hawkins, E; Heifetz, S; Rao, PV; Krailo, M; Castleberry, RP (J Clin Oncol, 1999)