1. Key Laboratory of Radiopharmaceuticals, Ministry of Education, College of Chemistry; Beijing Normal University; Beijing 100875 PR China
2. PET Center of Xuanwu Hospital; Capital Medical University; Beijing 100053 PR China
3. Department of Nuclear Medicine, Beijing Chao-Yang Hospital; Capital Medical University; Beijing 100020 PR China
4. Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Nuclear Medicine; Peking University Cancer Hospital and Institute; Beijing 100142 PR China