provider (Ahrens, Cabral, & Abeling, 2009; Ahrens et al., 2010; Littleton, 2010; Long, Ullman, Long, Mason, & Starzynski, 2007; Muganyizi, Nystrom, Axemo, & Emmelin, 2011; Ullman & Najdowski, 2009). The articles varied widely in terms of their approach. Of the 23 articles, there were 21 empirical studies, I li