“…Since the introduction of the dose-effect relationship, numerous researchers have explored this relationship in a range of different populations and using varied methodologies (e.g. Barkham et al, 1996;Barkham et al, 2006;Callahan & Hynan, 2005;Draper, Jennings, Baron, Erdur, & Shankar, 2002;Hansen & Lambert, 2003;Kadera, Lambert, & Andrews, 1996;Kopta, Howard, Lowry, & Beutler, 1994;Lambert, Hansen, & Finch, 2001;Lambert, Okiishi, Finch, & Johnson, 1998;Lueger, Lutz, & Howard, 2000;Wolgast, Lambert, & Puschner, 2003).…”