1. School of Medical Imaging, Tianjin Medical University, Tianjin 300203, China
2. Tianjin Medical University Eye Hospital, Tianjin 300384, China
3. Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin 300052, China
4. College of Chemistry, Key Laboratory of Functional Polymer Materials (Ministry of Education), Nankai University, Tianjin 300071, China