Effectiveness of a Mobile Phone-Delivered Multiple Health Behavior Change Intervention (LIFE4YOUth) in Adolescents: Randomized Controlled Trial. - Seiterö, Anna; Henriksson, Pontus; Thomas, Kristin; Henriksson, Hanna; Löf, Marie; Bendtsen, Marcus; Müssener, Ulrika (Journal of Medical Internet Research, 2025)