[1] Univ Munich, Klinikum Grosshadern, Dept Clin Radiol, D-81377 Munich, Germany
[2] Univ Munich, Klinikum Grosshadern, Dept Surg, D-81377 Munich, Germany
[3] Peking Univ, Sch Oncol, Beijing Inst Canc Res, Beijing Canc Hosp,Dept Ultrasonog, Beijing 100036, Peoples R China
[4] Chinese Acad Med Sci, Dept Ultrasonog, Peking Union Med Coll Hosp, Beijing 100730, Peoples R China
[5] Peking Union Med Coll, Beijing 100730, Peoples R China