Chumpitaz-Durand, Rubén Balabonce, and Daniel Ángel Córdova-Sotomayor. “Prevalence and Risk Factors for Extrinsic Discoloration in Deciduous Dentition of Peruvian Schoolchildren”. Revista Facultad de Odontología Universidad de Antioquia 29, no. 2 (May 17, 2018): 257–272. Accessed January 22, 2025. https://revistas.udea.edu.co/index.php/odont/article/view/325657.