1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative Medicine, College of Biological Science and Medical Engineering, Donghua University, Shanghai 201620, P. R. China
2. Department of Nuclear Medicine, Northern Jiangsu People's Hospital, Clinical Medical College, Yangzhou University, Yangzhou 225001, P. R. China
3. Office of Hospital Infection and Disease Control and Prevention, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P. R. China