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Delgado-Sanz, María Concepción; Prieto-Flores, Maria-Eugenia; Forjaz, Maria João; Ayala, Alba; Rojo-Perez, Fermina; Fernandez-Mayoralas, Gloria; Martínez-Martín, Pablo Influence of chronic health problems in dimensions of EQ-5D: study of institutionalized and non-institutionalized elderly. Revista Española de Salud Pública, 2011, vol.85, n. 6, ISSN 1135-5727.