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