1. Department of Social Work, Education, and Community Wellbeing Northumbria University Newcastle Upon Tyne UK
2. Department of Nursing, Midwifery and Health Northumbria University Newcastle upon Tyne UK
3. Clinical, Neuro‐, & Developmental Psychology Faculty of Behavioural and Movement Sciences VU Amsterdam The Netherlands
4. Department Sports and Health Sciences Technical University of Munich Munich Germany
5. HelloBetter, GET.ON Institute für Online Gesundheitstrainings GmbH Hamburg/Berlin Germany
6. Amsterdam Public Health Research Institute—Mental Health Amsterdam The Netherlands
7. Department of Health Services Research and Policy London School of Hygiene and Tropical Medicine & NIHR North Thames ARC London UK
8. Department of Public and Occupational Health Amsterdam Public Health Research Institute Amsterdam UMC The Netherlands
9. Section for Research‐Based Innovation, Forhelse Research Centre for Digital Mental Health Services Division of Psychiatry Haukeland University Hospital Bergen Norway