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Univ Sao Paulo, Hosp Clin, Gastrointestinal Endoscopy Unit, Sch Med, Ave Dr Eneas de Carvalho Aguiar 225,6o Andar, BR-05403010 Sao Paulo, SP, Brazil Univ Sao Paulo, Hosp Clin, Gastrointestinal Endoscopy Unit, Sch Med, Ave Dr Eneas de Carvalho Aguiar 225,6o Andar, BR-05403010 Sao Paulo, SP, Brazil