1. State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin, China
2. Department of Mechanical Engineering, University of Wyoming, Laramie, WY, USA
3. State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, Jiangsu, China
4. Schlumberger-Doll Research, Cambridge, MA, USA