1. The Second Clinical Medical School of Lanzhou University, the Second Hospital of Lanzhou University, Lanzhou 730030, China
2. Chinese Armed Police Force General Hospital of Gansu Province, Lanzhou 730000, China
3. Key Laboratory of Magnetism & Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou 730000, China
4. State Key Laboratory of Applied Organic Chemistry, College of Chemistry & Chemical Engineering, Lanzhou University, Lanzhou 730000, China
5. Nano Materials Group, School of Computing, Science & Engineering, University of Salford, Greater Manchester, M5 4WT, UK