1. School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, China
2. Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, Maryland 21218, United States
3. Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
4. Department of Environmental Health and Engineering, The Johns Hopkins University, Baltimore, Maryland 21218, United States
5. Department of Oncology, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, United States
6. The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, United States