[Tian, Gui-Xiang; Zhou, Shan; Xie, Hai-Qing; Guo, Yu-Yang] Cent South Univ, Dept Ultrason, Xiangya Hosp 2, Changsha, Peoples R China.
[Tian, Gui-Xiang] Cent South Univ, Res Ctr Ultrasonog, Xiangya Hosp 2, Changsha, Peoples R China.
[Zheng, PY; Peng, Ke-Ping] Zhengzhou Univ, Affiliated Hosp 5, Dept Gastroenterol, Zhengzhou, Peoples R China.
[Zheng, Peng-Yuan; Yu, Yong] Hunan Univ Chinese Med, Hosp 1, Dept Otorhinolaryngol Head & Neck Surg, Changsha, Peoples R China.
[Liang, Cheng-Bai] Cent South Univ, Dept Gastroenterol, Xiangya Hosp 2, Changsha, Peoples R China.