Validity and reproducibility of a food frequency questionnaire to estimate folate intake in a Mexican population.
Galván-Portillo M, Torres-Sánchez L, Hernández-Ramírez RU, Anaya-Loyola MA. Validity and reproducibility of a food frequency questionnaire to estimate folate intake in a Mexican population. Salud Pública De México 2011, 53: 237-46. PMID: 21829889, DOI: 10.1590/s0036-36342011000300008.Peer-Reviewed Original Research