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Results of quality assessment. Quality scores [0, 1] (y-axis): 0 = poor quality, 1 = excellent quality. Studies (x-axis): 1: Lin et al., 2013 [24]; 2: Chaboyer et al., 2012 [25]; 3: Chaboyer et al., 2006 [26]; 4: Crocker and Keller, 2005 [27]; 5: Gillman et al., 2006 [28]; 6: Johnson et al., 2013 [29]; 7: Kibler and Lee, 2011 [30]; 8: Silich et al., 2012 [31]; 9: Williams and Leslie, 2004 [32]; 10: Williams et al., 2010 [33].
