Simmons, C., Meiser-Stedman, R., Baily, H., & Beazley, P. A meta-analysis of dropout from evidence-based psychological treatment for post-traumatic stress disorder (PTSD) in children and young people. European Journal of Psychotraumatology, 12(1), 1947570. https://doi.org/10.1080/20008198.2021.1947570 (Original work published 2021)