COVID-19(12) COVID-19 pandemic(5) Anxiety(5) Depression(5) pandemic(5) Result(5) mental health(4) post-intervention(3) evaluated(3) Practice(3) feasible(3) face-to-face delivery(3) Support(3) follow-up period(3) parent(3) Children and adolescents(3) TIC(3) Quality of life(3) significantly(3) Treatment(3) Intervention(3) comparable(3) ranged(3) scale(3) Guided self-help(3) children(3) active control group(3) Gain(3) Comprehensive(3) severity(3)