1. Beijing Area Major Laboratory of Peptide and Small Molecular Drugs, Engineering Research Center of Ministry of Education of China, Beijing Laboratory of Biomedical Materials, School of Pharmaceutical Sciences, Capital Medical University, Beijing 100069, China
2. Division of Oral and Maxillofacial Surgery, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR 999077, China
3. National Center for Nanoscience and Technology, Beijing 100190, China
4. Department of Oral and Maxillofacial Surgery, Zhongshan Hospital, Fudan University, Shanghai 200032, China
5. Department of Chemistry, University of Copenhagen, Copenhagen DK-2100, Denmark