1. Department of Medical and Clinical Psychology, CoRPS – Center of Research on Psychological Disorders and Somatic Diseases, Tilburg University, Tilburg, the Netherlands
2. Department of Research, Netherlands Comprehensive Cancer Organisation (IKNL), Utrecht, the Netherlands
3. Centre for Psycho-Oncology, Scientific Research Department, Helen Dowling Institute, Bilthoven, the Netherlands
4. Department of Digital Health Research, Division of Medicine, Oslo University Hospital, Oslo, Norway
5. Faculty of Health and Social Sciences, University of South-Eastern Norway, Drammen, Norway
6. Department of Psychiatry and Psychology, College of Medicine and Science, Mayo Clinic, Rochester, MN, USA
7. Faculty of Medicine, Institute of Clinical Medicine, University of Oslo, Oslo, Norway
8. Department of Psychology, Health & Technology, Centre for eHealth & Well-Being Research, University of Twente, Enschede, the Netherlands