The Effect of Dissemination Pathways on Uptake and Relative Costs for a Transdiagnostic, Self-guided Internet Intervention for Reducing Depression, Anxiety, and Suicidal Ideation: Comparative Implementation Study - Philip J Batterham; Amelia Gulliver; Ella Kurz; Louise M Farrer; Christiaan Vis; Josien Schuurmans; Alison L Calear (Journal of Medical Internet Research, 2022)