AUTHOR=Liu Tao , Yao Yujiao , Yang Zhandong , Li Kaigeng , Yu Tao , Xia Yalong TITLE=The crowding-out effect of physical fitness activities on medical expenditure in the aged group JOURNAL=Frontiers in Public Health VOLUME=12 YEAR=2024 URL=https://www.frontiersin.org/journals/public-health/articles/10.3389/fpubh.2024.1425601 DOI=10.3389/fpubh.2024.1425601 ISSN=2296-2565