Assessment of the Efficacy of a Mobile Phone–Delivered Just-in-Time Planning Intervention to Reduce Alcohol Use in Adolescents: Randomized Controlled Crossover Trial

Severin Haug   ¹ , PhD ;   Raquel Paz Castro   ¹ , PhD ;   Urte Scholz   ² , PhD ;   Tobias Kowatsch   ^{3, 4} , PhD ;   Michael Patrick Schaub   ¹ , PhD ;   Theda Radtke   ⁵ , PhD

¹ Swiss Research Institute for Public Health and Addiction, University of Zurich, Zurich, Switzerland

² Applied Social and Health Psychology, University of Zurich, Zurich, Switzerland

³ Center for Digital Health Interventions, Institute of Technology Management, University of St Gallen, St Gallen, Switzerland

⁴ Center for Digital Health Interventions, Department of Technology, Management, and Economics, ETH Zurich, Zurich, Switzerland

⁵ Health, Work & Organizational Psychology, School of Psychology and Psychotherapy, Witten/Herdecke University, Witten/Herdecke, Germany