1. Department of Oncology, The Third People's Hospital of Hefei, Hefei, Anhui 230051, P.R. China
2. Department of Physiology, Anhui Medical University, Hefei, Anhui 230032, P.R. China
3. Department of Magnetic Resonance, The Third People's Hospital of Hefei, Hefei, Anhui 230051, P.R. China