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Stucki, Armin; Stucki, Gerold; Cieza, Alarcos; Schuurmans, Macé M; Kostanjsek, Nenad; Ruof, Jörg (2007). Content comparison of health-related quality of life instruments for COPD. Respiratory medicine, 101(6), pp. 1113-22. London: Elsevier 10.1016/j.rmed.2006.11.016
