1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, P. R. China
2. Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin, 300350, P. R. China
3. Department of Bioengineering, University of California Berkeley, Berkeley, California 94720, United States
4. Department of Biomedical Engineering, The State University of New York at Buffalo, Buffalo, New York 14260, United States