Combining Persuasive System Design Principles and Behavior Change Techniques in Digital Interventions Supporting Long-term Weight Loss Maintenance: Design and Development of eCHANGE

Rikke Aune Asbjørnsen   ^{1, 2, 3} , MSc ;   Jøran Hjelmesæth   ^{4, 5} , PhD ;   Mirjam Lien Smedsrød   ⁶ , MSc ;   Jobke Wentzel   ^{1, 7} , PhD ;   Marianne Ollivier   ³ , MSc ;   Matthew M Clark   ⁸ , PhD ;   Julia E W C van Gemert-Pijnen   ^{1, 9 *} , PhD ;   Lise Solberg Nes   ^{3, 8, 10 *} , PhD

¹ Center for eHealth and Wellbeing Research, Department of Psychology, Health and Technology, University of Twente, Enschede, Netherlands, The

² Research and Innovation Department, Vestfold Hospital Trust, Tønsberg, Norway

³ Department of Digital Health Research, Division of Medicine, Oslo University Hospital, Oslo, Norway

⁴ Morbid Obesity Center, Vestfold Hospital Trust, Tønsberg, Norway

⁵ Department of Endocrinology, Morbid Obesity and Preventive Medicine, Institute of Clinical Medicine, University of Oslo, Oslo, Norway

⁶ Collaborative Care Unit, Sørlandet Hospital Trust, Kristiansand, Norway

⁷ Research Group IT Innovations in Health Care, Windesheim University of Applied Sciences, Zwolle, Netherlands, The

⁸ Department of Psychiatry & Psychology, College of Medicine & Science, Mayo Clinic, Rochester, MN, United States

⁹ University of Waterloo, Waterloo, ON, Canada

¹⁰ Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway

*these authors contributed equally