Pandu Dwipatmasari, Irfan Hamdani. The Relationship Between Backpack Use and Low Back Pain Complaints in Grade VIII Students of Muhammadiyah 1 Middle School, Medan. ducare [Internet]. 2026 Sep. 10 [cited 2026 Sep. 15];4(02):132-40. Available from: https://seaninstitute.or.id/bersinar/index.php/ducare/article/view/274