Reinartz, Gabriele Andrea Christiane; Baehr, Andrea; Kittel, Christopher; Oertel, Michael; Haverkamp, Uwe; Haverkamp, U.; Eich, Hans-Theodor; Eich, Hans Theodor; Eich, Hans Theodor; Eich, Hans Theodor: Biophysical Analysis of Acute and Late Toxicity of Radiotherapy in Gastric Marginal Zone Lymphoma—Impact of Radiation Dose and Planning Target Volume