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Michel, Gisela; Bisegger, Corinna; Fuhr, Daniela C; Abel, Thomas (2009). Age and gender differences in health-related quality of life of children and adolescents in Europe: a multilevel analysis. Quality of life research, 18(9), pp. 1147-57. Dordrecht: Springer Netherlands 10.1007/s11136-009-9538-3
