Impact of awareness of sports policies, school, family, and community environmental on physical activity and fitness among children and adolescents: a structural equation modeling... oleh Junyu Wang, Shengyong Wu, Xuhui Chen, Bingjie Xu, Jianfeng Wang, Yong Yang, Weiqi Ruan, Pengpeng Gao, Xiaolin Li, Ting Xie, Kunyi Yang, Jie Zhuang