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Bernhard, Jürg; Lowy, Adam; Mathys, Natascha; Herrmann, Richard; Hürny, Christoph (2004). Health related quality of life: a changing construct? Quality of life research, 13(7), pp. 1187-97. Dordrecht: Springer 10.1023/B:QURE.0000037485.59681.7d