00000nam a2200000 a 4500 Goodyear, Victoria A. aut Verfasser/-in Randhawa, Amie aut Verfasser/-in Schule Handyverbot School phone policies and their association with mental wellbeing, phone use, and social media use (SMART Schools): a cross-sectional observational study Victoria A. Goodyear ; Amie Randhawa 2025 W:\Digitale Publikationen\Schule\SchSp\00504171_School phone policies and their association with mental wellbeing, phone use, and social media use (SMART Schools). A cross-sectional observational study.pdf S. 15