Sarif, Iqbal; Elsayad, Khaled; Elsayad, Khaled Abdelsalam Mohamed Shahereldin; Daniel, Rolf; Kittel, Christopher; Gosheger, Georg; Wardelmann, Eva; Haverkamp, Uwe; Haverkamp, U.; Eich, Hans-Theodor; Eich, Hans Theodor; Eich, Hans Theodor; Eich, Hans Theodor: The Lymph-Sparing Quotient: A Retrospective Risk Analysis on Extremity Radiation for Soft Tissue Sarcoma Treatment