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Univ Sao Paulo, Med Sch, Gastroenterol Dept, Gastrointestinal Endoscopy Unit, Sao Paulo, Brazil
Univ Sao Paulo, Ctr Gastrointestinal Endoscopy, Ribeirao Preto Med Sch, Ribeirao Preto, Brazil
Univ Sao Paulo, Anat Dept, Ribeirao Preto Med Sch, Ribeirao Preto, Brazil Univ Sao Paulo, Med Sch, Gastroenterol Dept, Gastrointestinal Endoscopy Unit, Sao Paulo, Brazil