1. Department of Biomedical Engineering, University of Virginia School of Medicine, Charlottesville, Virginia 22904, USA
2. Department of Electrical and Computer Engineering, University of Virginia School of Engineering and Applied Science, Charlottesville, Virginia 22904, USA
3. Division of Mathematical Oncology, City of Hope, Duarte, California 91010, USA
4. Department of Biomedical Engineering and Mechanics, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA