1. a Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies , Peking University , Beijing , 100871 , P.R. China
2. b Beijing Key Laboratory for Solid Waste Utilization and Management, College of Engineering , Peking University , Beijing , 100871 , P.R. China
3. c Institute for Medical Devices Control , National Institutes for Food and Drug Control , Beijing , 100050 , P.R. China
4. d Department of Chemistry , University of Michigan , Ann Arbor , Michigan , 48109-1055 , USA
5. e Renal Division, Department of Medicine, Peking University First Hospital, Institute of Nephrology, Key Laboratory of Renal Disease, Ministry of Health of China , Peking University , Beijing , 100034 , P.R. China
6. f Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatology , Peking University , Beijing , 100871 , P.R. China