Proton stereotactic body radiation therapy for liver metastases—results of 5-year experience for 81 hepatic lesions

Alex R. Coffman, Daniel C. Sufficool, Joseph I. Kang, Chung-Tsen Hsueh, Sasha Swenson, Patrick Q. McGee, Gayathri Nagaraj, Baldev Patyal, Mark E. Reeves, Jerry D. Slater, Gary Y. Yang