“…To supplement data, attempts to contact the authors of three studies who provided email addresses were made but none replied (Malmqvist et al, 2000; Van Bortel et al, 2005; Weir et al, 2005). Twenty studies did not use a validated scale for measuring QoL and were hence excluded (Bracchetti et al, 1990; Conlin et al, 1998; Croog et al, 1986; Ebert and Kirch, 1999; Fagher et al, 1991; Fletcher et al, 1992; Freytag et al, 2001; Hu and Zhu, 1999; Lacourciere, 1988; Lewis et al, 1996; McMahon et al, 1990; Neaton et al, 1993; Oparil et al, 1996; Paran et al, 1996; Perry et al, 1994; Tanser et al, 2000; Tedesco et al, 1999; Testa et al, 1993; Weir et al, 1996a; Yodfat et al, 1985). One study was excluded as it employed a scale that assessed a purely physical domain of QoL (Ostergren et al, 1996).…”