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Aktifah N. The Effect of Strengthening Ball Roll Exercise and Strengthening Heel Raises Exercise On Static Balance In Children With Flat Foot In Sragi Subdistrict. GASTER [Internet]. 2021 Aug. 30 [cited 2025 Apr. 19];19(2):125-34. Available from: https://journal.aiska-university.ac.id/index.php/gaster/article/view/571