[1] Univ Penn, Dept Radiat Oncol, Philadelphia, PA 19104 USA
[2] Univ Penn, Dept Radiat Oncol, Perelman Sch Med, Philadelphia, PA 19104 USA
[3] Univ Penn, Dept Med, Div Hematol Oncol, Philadelphia, PA 19104 USA
[4] Univ Penn, Dept Surg, Philadelphia, PA 19104 USA
[5] Univ Calif San Francisco, Dept Radiat Oncol, San Francisco, CA USA
[6] Cleveland Clin Florida, Hematol Oncol, Weston, FL USA
[7] Univ Penn, Dept Med, Sect Intervent Pulmonol & Thorac Oncol, Philadelphia, PA 19104 USA
[8] Univ Penn, Div Hematol & Oncol, Philadelphia, PA 19104 USA
[9] New York Proton Ctr, New York, NY USA