1. Institute of Biophysics, School of Physics and Key Laboratory of Molecular Biophysics of the Ministry of Education, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China
2. Institute of Biophysics and Department of Physics, Central China Normal University, Wuhan 430079, China
3. Department of Physics, The George Washington University, Washington, DC 20052, USA
4. School of Life Sciences, Jianghan University, Wuhan 430056, China