Bonazza, V., C. Dellavia, M. Labanca, D. Merigo, and E. Borsani. “Concentrated Growth Factors (CGF): Morphological and Biochemical Characterization”. Italian Journal of Anatomy and Embryology, vol. 120, no. 1, Sept. 2015, p. 18, https://oajournals.fupress.net/index.php/ijae/article/view/3972.