A Playful Smartphone-based Self-regulation Training for the Prevention and Treatment of Child and Adolescent Obesity: Technical Feasibility and Perceptions of Young Patients. - Tobias Kowatsch; Chen-Hsuan Iris Shih; Yanick X. Lukic; Olivia C. Keller; Katrin Heldt; Dominique Durrer; Aikaterini Stasinaki; Dirk Büchter; Björn Brogle; Nathalie Farpour-Lambert; Dagmar L'Allemand-Jander (IUI Workshops, 2021)