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Univ Sao Paulo, Gastrointestinal Endoscopy Unit, Sch Med, Av Dr Eneas Carvalho Aguiar 255, BR-05403010 Sao Paulo, SP, Brazil
Harvard Med Sch, Brigham & Womens Hosp, Div Gastroenterol Hepatol & Endoscopy, Boston, MA 02115 USA Univ Sao Paulo, Gastrointestinal Endoscopy Unit, Sch Med, Av Dr Eneas Carvalho Aguiar 255, BR-05403010 Sao Paulo, SP, Brazil