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Conceptualization, operationalization, and content validity..:

Jespersen, Louise Norman ; Michelsen, Susan Ishøy ; Holstein, Bjørn Evald..
Jespersen , L N , Michelsen , S I , Holstein , B E , Tjørnhøj-Thomsen , T & Due , P 2018 , ' Conceptualization, operationalization, and content validity of the EQOL-questionnaire measuring quality of life and participation for persons with disabilities ' , Health and Quality of Life Outcomes , vol. 16 , 199 . https://doi.org/10.1186/s12955-018-1024-6.  , 2018