Recurrences near base of skull after IMRT for head-and-neck cancer: implications for target delineation in high neck and for parotid gland sparing - Eisbruch, A; Marsh, L H; Dawson, L A; Bradford, C R; Teknos, T N; Chepeha, D B; Worden, F P; Urba, S; Lin, A; Schipper, M J; Wolf, G T (Int J Radiat Oncol Biol Phys, 2004)