“…There were 19 articles that met the inclusion criteria and contained sufficient data available for review. Of these, nine were based on catheterization data alone (Rowe,1963; Emmanouilides et al,1964; Venables,1965; Sperling and Verska,1966; Hastreiter et al,1967; Celermajer et al,1969; Lie et al,1970; Kher et al,1980; Gorenflo et al,2002), nine on echocardiographic data alone (Janner,1991; Robinson et al,1994; Bullens et al,2000; St John and Benjamin,2000; Agarwal et al,2001; Banerji et al,2005; Koklu et al,2006; Wui et al,2006; Plotinsky et al,2007), and one on both catheterization and echocardiographic data (Moore and Mullins,1986) (Fig. 1).…”