Corrigendum: Music Therapy in the Psychosocial Treatment of Adult Cancer Patients: A Systematic Review and Meta-Analysis - Köhler, Friederike; Martin, Zoe-Sofia; Hertrampf, Ruth-Susanne; Gäbel, Christine; Kessler, Jens; Ditzen, Beate; Warth, Marco (Frontiers in Psychology, 2020)