1. School of Physics, Dalian University of Technology, Dalian, China
2. DUT-BSU Joint Institute Dalian University of Technology, Dalian University of Technology, Dalian, China
3. College of Electronic Information and Optical Engineering, Taiyuan University of Technology, Taiyuan, China
4. Cancer Hospital of Dalian University of Technology (Liaoning Cancer Hospital and Institute), Shenyang, China