“…The basic purpose of the literature review is to provide context for research and justify it, identify what is already done in the area and identify research gaps, justify significance of the research undertaken, and gain new perspectives on the existing literature (Boote and Beile, 2005). The most common approaches for review of literature are narrative (Bellini and Rumrill, 2009), empirical (Cook et al, 1998), meta-analysis (Glass, 1976;Cooper, 1982;Bolton and Akridge, 1995;Swanson and Deshler, 2003;Harwell and Maeda, 2008), systematic (Dixon-Woods and Fitzpatrick, 2001;Andrews and Harlen, 2006;Moher et al, 2007;Bellini and Rumrill, 2009;Poth and Ross, 2009), and scoping reviews (Arksey and O'Malley, 2005;McColl, 2007;Anderson et al, 2008;Davis, et al, 2009).…”