Effect sizes at post-treatment (T0-T1) were calculated with Cohen’s d using the means and the pooled standard deviations of the measurements in the conditions. For the effect sizes at followup (T0-T2) the Cohen’s d was corrected for dependence among means by using the correlation between the two means [35]. To interpret Cohen’s d an effect size of less than 0.33 is considered small, while 0.33 to 0.55 is considered moderate and effect sizes of 0.56 to 1.2 are considered large [36]. Comparisons were two-tailed and interpreted with a significance value of p,0.05.