AUTHOR=Li Chunmei , Han Xiong-Zhe TITLE=Increased physical activity frequency in primary school adolescents is related to reduced risk of self-reported adverse mental health symptoms JOURNAL=Frontiers in Public Health VOLUME=12 YEAR=2024 URL=https://www.frontiersin.org/journals/public-health/articles/10.3389/fpubh.2024.1506432 DOI=10.3389/fpubh.2024.1506432 ISSN=2296-2565