Marchisio, Marco, et al. “Circulating Endothelial Cell Evaluation in Peripheral Blood from Healthy Subjects and Diabetes Mellitus Patients by Applying a Single Platform Absolute Count in a Four-Color Flow Cytometric Assay”. Italian Journal of Anatomy and Embryology, vol. 115, no. 1/2, Nov. 2010, p. 104, https://oajournals.fupress.net/index.php/ijae/article/view/4489.