El-Alali, Emran, et al. “Carotid Artery Stenosis in Syncope and in Carotid Sinus Syndrome: A Few Concepts for the General Practitioner to Know”. Cardiology and Cardiovascular Medicine, vol. 5, no. 1, Jan. 2021, pp. 106-22, http://www.fortunejournals.org/ojs/index.php/ccm/article/view/16028.