[Chen, Min-hu; Tan, Nian-di; Xiao, Ying-lian] Sun Yat Sen Univ, Affiliated Hosp 1, Dept Gastroenterol, Guangzhou 510080, Guangdong, Peoples R China.
[Liu, Xiao-wei] Cent South Univ, Xiangya Hosp, Dept Gastroenterol, Changsha, Peoples R China.
[Chen, Hong-hui] Univ South China, Hosp 2, Dept Gastroenterol, Hengyang, Hunan, Peoples R China.
[Liao, Ai-Jun] Univ South China, Affiliated Hosp 1, Dept Gastroenterol, Hengyang, Hunan, Peoples R China.
[Liu, Cheng-xia] Binzhou Med Univ Hosp, Dept Gastroenterol, Binzhou, Peoples R China.