1. Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, Key Laboratory of Eco-environmental Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
2. Institute of Gansu Medical Science Research, Gansu Provincial Cancer Hospital, Lanzhou 730050, China
3. Southeast University Zhongda Hospital, Jiangsu Key Laboratory of Molecular Imaging and Functional Imaging, School of Medicine, Southeast University, Nanjing 210009, China
4. Gansu Provincial Hospital, Lanzhou 730000, P. R. China