Epidemiology of upper gastrointestinal symptoms in Brazil (EpiGastro): a population-based study according to sex and age group - Latorre, Maria do Rosário Dias de Oliveira; Silva, Aline Medeiros da; Chinzon, Décio; Eisig, Jaime Natan; Dias-Bastos , Telma RP (World Journal of Gastroenterology, 2014)