1. Joint
Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Raleigh, North Carolina 27695, United States
2. Center
for Nanotechnology in Drug Delivery and Division of Molecular Pharmaceutics,
UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
3. Department
of Pathology and Cell Biology, Naomi Berrie Diabetes Center, Columbia University, New York, New York 10032, United States
4. Key
Laboratory of Polymer Ecomaterials, Changchun Institute of Applied
Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
5. Department
of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States