Agreement Between Fitbit And Actigraph Estimates Of Physical Activity In Young Children: 636 May 27 2:15 PM ‐ 2:30 PM. (July 2020) - Schmidt, Michael D.; Rathbun, Stephen; Chu, Zhixuan; Boudreaux, Benjamin D.; Hahn, Lindsay; Johnsen, Kyle; Ahn, Sun Joo