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机构:
Univ Sao Paulo, Fac Med, Hosp Clin, Gastrointestinal Endoscopy Div,Dept Gastroenterol, BR-05403000 Sao Paulo, Brazil
Univ Adelaide, Lyell McEwin & Modbury Hosp, Dept Gastroenterol, Adelaide, SA 5000, Australia Univ Adelaide, NALHN Sch Med, Lyell McEwin & Modbury Hosp, Dept Gastroenterol, Adelaide, SA 5112, Australia