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Effect of school closure due to COVID-19 on children’s physical activity levels. The steps per hour for the period between January 8, 2020 (opening of schools after the Christmas holidays) and March 10, 2020 (school closure) are depicted on the left, while on the right, the steps per hour for the period between March 11 and 31 (end of data collection) is depicted. The black lines define the boundaries of each municipality in the city of Thessaloniki. Source: OpenStreetMap [41].
