1. CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety National Center for Nanoscience and Technology (NCNST) Beijing 100190 P. R. China
2. School of Nanoscience and Technology University of Chinese Academy of Sciences (UCAS) Beijing 100149 P. R. China
3. Institute of Bioengineering and Institute of Materials Science & Engineering École Polytechnique Fédérale de Lausanne (EPFL) Lausanne 1015 Switzerland
4. Lab of Functional and Biomedical Nanomaterials College of Materials Science and Engineering Qingdao University of Science and Technology (QUST) Qingdao 266042 P. R. China