Evaluation of salivary gland function after treatment of head-and-neck tumors with intensity-modulated radiotherapy by quantitative pertechnetate scintigraphy - Münter, M W; Karger, C P; Hoffner, S G; Hof, H; Thilmann, C; Rudat, V; Nill, S; Wannenmacher, M; Debus, J (Int J Radiat Oncol Biol Phys, 2004)