The Effect of a Consumer-Based Activity Tracker Intervention on Accelerometer-Measured Sedentary Time Among Retirees: A Randomized Controlled REACT Trial - Suorsa, Kristin; Leskinen, Tuija; Pulakka, Anna; Pentti, Jaana; Löyttyniemi, Eliisa; Heinonen, Ilkka; Vahtera, Jussi; Stenholm, Sari (The journals of gerontology. Series A, Biological sciences and medical sciences, 2022)