P. C. Simarmata, A. S. G. Purba, A. L. Sitepu, E. S. Harahap, and J. M. Simarmata, “THE EFFECT OF FOOT EXERCISE ON ANKLE BRACHIAL INDEX VALUE IN DIABETES MELLITUS PATIENTS IN HOSPITAL GRANDMED HOSPITAL PAKAM”, JKF, vol. 3, no. 2, pp. 153–158, Apr. 2021.