* Corresponding authors

^a Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, PR China
E-mail: duyanan@tsinghua.edu.cn
Fax: +86 10 62773380
Tel: +86 10 62781691

^b School of Biological Science and Medical Engineering, Beihang University, Beijing, PR China

^c Center for Biomedical Imaging Research & Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, PR China

^d State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, PR China

^e MOE Key Laboratory of Biomedical Information Engineering, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, PR China

^f Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Hangzhou, PR China