1. Key
Laboratory of Biomedical Information Engineering of Education Ministry,
School of Life Science and Technology, Xi’an Jiaotong University, Xianning West Road, Xi’an, Shaanxi 710049, P. R. China
2. Division
of Physical Biology, and Bioimaging Center, Shanghai Synchrotron Radiation
Facility, CAS Key Laboraotory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Yuquan Road, Shanghai 201800, P. R. China