AUTHOR=Han Xue , Li Cheng-Han , Miao Heng , Xu Su , Yan Wen-Jing , Chen Juan TITLE=Sleep patterns and smartphone use among left-behind children: a latent class analysis and its association with depressive symptoms JOURNAL=Frontiers in Psychiatry VOLUME=15 YEAR=2025 URL=https://www.frontiersin.org/journals/psychiatry/articles/10.3389/fpsyt.2024.1500238 DOI=10.3389/fpsyt.2024.1500238 ISSN=1664-0640