Statistical analysis
Statistical analysis will be performed by the blinded assessor using SPSS software (IBM version 23, SPSS Inc., Chicago, Il). Descriptive statistics will be computed for all variables (e.g. mean, standard deviation). Data will be tested for normal distribution by the Shapiro-Wilk test. Chi-square tests will be performed to compare self-reported recovery (successful x unsuccessful) between groups. For continuous data, the effects of group, time and their interaction will be assessed with linear mixed models. Intraclass Correlation Coefficients will be used to determine the amount of variance explained by random effects [The mediation effects will be assessed following the 3-variable framework described by MacKinnon et al. [