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Guideline for the economic evaluation of medicines: a proposal by the Spanish National Health System's Advisory Committee for Pharmaceutical Financing Marta Trapero-Bertran, Juan Oliva, Ferrán Catalá-López, Lidia García-Pérez, Lluís Segú, Emilio Jesús Alegre-del-Rey, Ana Clopés, Félix Lobo, Ana Ortega, Jaume Puig-Junoy