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Univ Sao Paulo, Hosp Clin HCFMUSP, Fac Med,Gastrointestinal Endoscopy Serv, Dept Gastroenterol, Sao Paulo, SP, Brazil
Univ Sao Paulo, Hosp Clin,Fac Med, Dept Gastroenterol, Gastrointestinal Endoscopy Unit, Ave Dr Eneas Carvalho Aguiar,Cent Inst Outpatient, BR-05403000 Sao Paulo, SP, Brazil Univ Sao Paulo, Hosp Clin HCFMUSP, Fac Med,Gastrointestinal Endoscopy Serv, Dept Gastroenterol, Sao Paulo, SP, Brazil