1. State Key Laboratory of Molecular Vaccinology and Molecular Diagnosis and Center for Molecular Imaging and Translational Medicine; School of Public Health; Xiamen University; Xiamen 361102 P. R. China
2. Department of Biomaterials and Fujian Provincial Key Laboratory of Fire Retardant Materials; College of Materials; Xiamen University; Xiamen 361005 P. R. China
3. Department of Electronic Science; College of Physics and Electromechanical Engineering; Xiamen University; Xiamen 361005 P. R. China