Efforts to Improve Female Adolescents’ Knowledge of Breast Self-Examination (BSE) through Health Promotion Activities at Trisakti Junior High School, Lubuk Pakam. JPK [Internet]. 2025 Dec. 31 [cited 2026 Jan. 6];5(2):276-81. Available from: https://ejournal.medistra.ac.id/index.php/JPK/article/view/3319