A quasi-experimental study on physical activity and screen time intervention among preschool children in Daxing District, Beijing
GAO Yanqing, DONG Yuan, BAI Xinyuan, JI Ying, GAO Yuyang, GONG Litong
Chinese Journal of School Doctor . 2026, (9): 696 -701 .  DOI: 10.20161/j.cnki.32-1199/R.20260142