1. School of Chemistry and Pharmaceutical Engineering; Taishan Medical University, Taian; Shandong 271016 P. R. China
2. Key Laboratory of Cerebral Microcirculation in Universities of Shandong and Department of Neurology of Affiliated Hospital; Taishan Medical University, Taian; Shandong 271016 P. R. China
3. Institute of Optometry and Department of Ophthalmology of Affiliated Hospital; Taishan Medical University, Taian; Shandong 271016 P. R. China
4. College of Materials Science and Engineering; Qingdao University of Science and Technology, Qingdao; Shandong 266042 P.R. China