Sforza, Chiarella, and Virgilio F. Ferrario. 2010. “Three-Dimensional Analysis of Facial Morphology: Growth, Development and Aging of the Orolabial Region”. Italian Journal of Anatomy and Embryology 115 (1/2):141-45. https://oajournals.fupress.net/index.php/ijae/article/view/1072.