Increasing Knowledge of Class VI Elementary School Students About the Dangers of Rheumatoid Arthritis (RA) at Public Elementary School 106830 Sidodadi Ramunia Village Lubuk Pakam. JPK [Internet]. 2024 Dec. 30 [cited 2025 Dec. 4];4(2):203-8. Available from: https://ejournal.medistra.ac.id/index.php/JPK/article/view/2386