Under-reporting of food intake is frequent among Brazilian free-living older persons: a doubly labelled water study - Ferriolli, Eduardo; Pfrimer, Karina; Moriguti, Júlio César; Lima, Nereida Kilza da Costa; Moriguti, Eny K. U.; Formighieri, Paulo F.; Scagliusi, Fernanda Baeza; Marchini, Julio Sergio (Rapid Communications in Mass Spectometry, 2010)