1. Center
for Drug Delivery System, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201210, China
2. Department of Biomaterials, Field of Tissue Engineering,
Institute for Frontier Medical Sciences, Kyoto University, Kyoto 606-8507, Japan
3. Center
for Bionanoengineering and Key Laboratory of Biomass Chemical Engineering
of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China