Contribution of Qualitative Methods in the Validity of an Instrument which Measures Quality of Life Related to Health in Children Suffering from a Chronic Illness by María Isabel Toledo Gutiérrez, Ana María Alarcón Muñoz, Luis Bustos Medina, Felipe Heusser Risopatrón, Eduardo Hebel Weiss, Pedro Lorca Osorio, María Elisa Castillo Niño, Francisco Garay Greve

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