Hartono, Febryanti, Yudi Oktaviono, and Djoko Soemantri. “Effect of Sweet Purple Potato (Ipomoea Batatas L.) Extract and Vitamin C on Endothelial Progenitor Cell Migration in Stable Coronary Disease Patient”. Indonesian Journal of Cardiology 40, no. 4 (September 11, 2019). Accessed November 13, 2019. http://ijconline.id/index.php/ijc/article/view/843.