1 Department of Radiation Oncology, University of Pennsylvania, Philadelphia, Pennsylvania. Electronic address: hann-hsiang.chao@pennmedicine.upenn.edu.
2 Department of Internal Medicine, Division of Hematology Oncology, University of Pennsylvania, Philadelphia, Pennsylvania.
3 Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania.
4 Department of Radiation Oncology, University of Pennsylvania, Philadelphia, Pennsylvania.