1. Beijing Key Lab of Cryo-Biomedical Engineering and Key Lab of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
2. Institute of Applied Physics, Jiangxi Academy of Sciences, Nanchang 330000, China
3. Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing 100084, P. R. China