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机构:
Sun Yat Sen Univ, Phys Examinat Ctr, Huangpu Div, Affiliated Hosp 1, Guangzhou 510700, Guangdong, Peoples R China Sun Yat Sen Univ, Dept Gastroenterol, Huangpu Div, Affiliated Hosp 1, Guangzhou 510700, Guangdong, Peoples R China