Relative validity of a semi-quantitative food-frequency questionnaire in an elderly Mediterranean population of Spain by Fernández-Ballart, Joan D., Piñol, Josep Lluís, Zazpe, Itziar, Corella, Dolores, Carrasco, Paula, Toledo, Estefanía, Perez-Bauer, Manuel, Martínez-González, Miguel Ángel, Salas-Salvadó, Jorge, Martín-Moreno, José M.

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