1. East Carolina University, Department of Physics, Greenville, North Carolina 27858, United States
2. East Carolina University, Department of Internal Medicine, Brody School of Medicine, Greenville, North Carolina 27834, United States
3. Tianjin University, Department of Biomedical Engineering, 92 Weijin Road, Tianjin 300072, China
4. East Carolina University, Department of Computer Science, Greenville, North Carolina 27858, United States