Statistical analysis
The sample size was calculated using an a priori power analysis by G*Power software, version 3.1.9.4. Given a statistical power (1-ß error) of 0.9 (using the MANOVA statistical test: Repeated measures, within-between interaction) and a moderate effect size (ES) of 0.6, the total sample size resulted in 44 subjects. However, considering a 20% drop out rate, the minimal sample size was set at 52 subjects. The Statistical Package for Social Science (SPSS, v. 22