1. Department of Radiology, Southwest Hospital; Army Medical University; Chongqing China
2. Department of Radiology; Guizhou Provincial People's Hospital Guiyang China
3. Department of Radiology; Michigan State University; East Lansing MI USA
4. Laboratory of Soft Machines and Electronics, School of Packaging, Departments of Mechanical, Electrical and Computer Engineering; Michigan State University; East Lansing MI USA