[1] Tongji Univ, Sch Med, Dept Med Imaging, Tongji Hosp, Shanghai 200065, Peoples R China
[2] Naval Med Univ, Changhai Hosp, Dept Gastroenterol, Shanghai 200433, Peoples R China
[3] Fudan Univ, Huashan Hosp, Dept Urol, Shanghai 200040, Peoples R China
[4] Tongji Univ, Sch Med, Shanghai Peoples Hosp 10, Dept Med Ultrasound, Shanghai 200072, Peoples R China
[5] Fudan Univ, Dept Mat Sci, Shanghai 200438, Peoples R China
[6] State Fudan Univ, Key Lab Mol Engn Polymers, Shanghai 200438, Peoples R China