Assertion: gratitude's relationship | /r/HasProperty | replicated across a number of studies
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text: These relationships have now been replicated across a number of studies that have included diverse age groups, measurement methods, and cultures (e.g., Adler & Fagley, 2005; Chen & Kee, 2008; Froh, Yurkewicz, & Kashdan, 2009; Park, Peterson, & Seligman, 2004; Peterson, Ruch, Beerman, Park, & Seligman, 2007; Thomas & Watkins, 2003; Toussaint & Friedman, 2009).