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Rospita Panjaitan, Ester Julinda Simarmata, Rosdiana Samosir. Health Optimization in Primary Schools: Instilling Handwashing Habits as a Proactive Step Towards a Healthy Learning Environment . JERKIN [Internet]. 2024 Jan. 14 [cited 2026 Jul. 24];2(3):206-10. Available from: https://jerkin.org/index.php/jerkin/article/view/246