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CAMS, PUMC Hosp, Dept Gastroenterol, 1 Shuai Fu Yuan, Beijing 100730, Peoples R China
PUMC, 1 Shuai Fu Yuan, Beijing 100730, Peoples R China CAMS, PUMC Hosp, Dept Gastroenterol, 1 Shuai Fu Yuan, Beijing 100730, Peoples R China