Toledo Gutiérrez, M. I., Alarcón Muñoz, A. M., Bustos Medina, L., Heusser Risopatrón, F., Hebel Weiss, E., Lorca Osorio, P., … Garay Greve, F. (2009). 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. Forum Qualitative Sozialforschung Forum: Qualitative Social Research, 10(2). https://doi.org/10.17169/fqs-10.2.1311