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