Barriers and Facilitators of User Engagement With Digital Mental Health Interventions for People With Psychosis or Bipolar Disorder: Systematic Review and Best-Fit Framework Synthesis

Emily Eisner   ^{1, 2} , PhD ;   Sophie Faulkner   ^{1, 2} , PhD ;   Stephanie Allan   ³ , PhD ;   Hannah Ball   ^{1, 2} , DClin ;   Daniela Di Basilio   ^{1, 4} , PhD ;   Jennifer Nicholas   ^{5, 6} , PhD ;   Aansha Priyam   ^{1, 3} , MRes ;   Paul Wilson   ⁷ , BA ;   Xiaolong Zhang   ¹ , PhD ;   Sandra Bucci   ^{1, 2} , DClin

¹ Division of Psychology and Mental Health, University of Manchester, Manchester, United Kingdom

² Greater Manchester Mental Health NHS Foundation Trust, Manchester, United Kingdom

³ School of Health and Wellbeing, University of Glasgow, Glasgow, United Kingdom

⁴ Division of Health Research, Faculty of Health and Medicine, Lancaster University, Lancaster, United Kingdom

⁵ Centre for Youth Mental Health, University of Melbourne, Melbourne, Australia

⁶ Orygen, Melbourne, Australia

⁷ Division of Population Health, Health Services Research & Primary Care, University of Manchester, Manchester, United Kingdom