Tumor Response after Preoperative Chemoradiation Therapy with Simultaneous Integrated Boost Using Volumetric Modulated Arc Therapy in Locally Advanced Rectal Cancer - DEVRAN, BENNUR ZEYNAN; ÖZTÜRK, FATİH EMİN; ALKIŞ, HİLAL; ATALAY, VAFİ (ELSEVIER SCIENCE INC, 2019)