Adekoya, N. M., daCosta, O. O., & Utomi, I. L. (2015). Vertical Lip Thickness and Gingival Display: Comparing the Perception of Dental Professionals and Laypersons in Nigeria. West African Journal of Orthodontics, 4(1), 19–25. Retrieved from https://wajo.oauife.edu.ng/index.php/wajo/article/view/33