O’Brien, Tanya, and Aileen Lynch. “The Impact of the COVID-19 Lockdown Restrictions on Physical Activity Levels in European Adolescents: A Systematic Review and Meta-Analysis”. European Scientific Journal, ESJ 19, no. 21 (July 31, 2023): 1. Accessed May 9, 2024. https://eujournal.org/index.php/esj/article/view/17042.