1. Department of Industrial Engineering, University of Arkansas, Fayetteville, AR, USA
2. Department of Radiology, University of Washington, Seattle, WA, USA
3. Department of Industrial, Manufacturing & Systems Engineering, University of Texas at Arlington, Arlington, TX, USA
4. Department of Mechanical Engineering, Tongji University, Shanghai, China
5. Department of Radiation Oncology, University of Washington, , Seattle, WA, USA