“EFFECTIVENESS OF BACK ENDORPHIN MASSAGE AGAINST DECREASED DYSMENORRHEA IN STUDENTS OF THE FACULTY OF NURSING, UNIVERSITAS SUMATERA UTARA” (2023) Al Insyirah International Scientific Conference on Health, 3(1), pp. 218–224. Available at: https://jurnal.ikta.ac.id/aisch/article/view/2389 (Accessed: 22 July 2026).