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Quality of life is often measured using questions about happiness. This method presumes that respondents are able to judge their life. Research suggest that this is typically the case, but this is not to say that everybody can. In that context one may doubt whether people with a mental disorder can judge their life adequately. Happiness can be rejected as a indicator for quality of life for people...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.