[1] East China Normal Univ, Sch Phys & Elect Sci, Phys Dept, North Zhongshan Rd 3663, Shanghai 200062, Peoples R China
[2] East China Normal Univ, Sch Phys & Elect Sci, Shanghai Key Lab Magnet Resonance, North Zhongshan Rd 3663, Shanghai 200062, Peoples R China
[3] Beijing Forestry Univ, Beijing Key Lab Lignocellulos Chem, Beijing 100083, Peoples R China
[4] East China Normal Univ, Inst Magnet Resonance & Mol Imaging Med, Shanghai, Peoples R China