Suárez-Martínez, Edu B., et al. “Early-Onset of Sporadic Basal-Cell Carcinoma: Germline Mutations in the TP53, PTCH, and XPD Genes”. Puerto Rico Health Sciences Journal, vol. 26, no. 4, Dec. 2007, https://prhsj.rcm.upr.edu/index.php/prhsj/article/view/223.