Kacar, E., O. Burma, I. Serhatlioglu, N. Ulker, A. Yardimci, A. Uysal, and H. Kelestimur. “Apelin Has Inhibitory Effect of Endothelium-Independent Relaxation in the Human Internal Mammary Artery”. Annals of Medical Research, vol. 26, no. 3, May 2021, pp. 0443-6, http://www.annalsmedres.org/index.php/aomr/article/view/1329.