1. Diagnostic Imaging Center, Weihai Central Hospital, Weihai, Shandong 264400, P.R. China
2. Department of Ophthalmology, Weihai Central Hospital, Weihai, Shandong 264400, P.R. China
3. Department of Science and Education, Yantai Yuhuangding Hospital, Yantai, Shandong 264000, P.R. China
4. Department of Interventional Therapy, Yantai Yuhuangding Hospital, Yantai, Shandong 264000, P.R. China