“…Many either failed to use a randomized clinical trial (RCT) or controlled trial without randomizing (Goranson, Graves, Allison, & La Freniers, 2003;Gronwall, 1986;Minderhoud, Boelens, Huizenga, & Saan, 1980), or failed to state the process of randomization when used (Ghaffar, McCullagh, Ouchterlony, & Feinstein, 2006;Rath, Simon, Langenbahn, Sherr, & Diller, 2003). Only two studies (Tiersky et al, 2005;Elgmark Andersson, Emanuelson, Bjorklund, & Stalhammer, 2007) explained a process for concealing group allocation, and only three studies reported blind outcomes measurement (Elgmark Andersson et al, 2007;Leonard, 2004;Tiersky et al, 2005).…”