Dominguez-Cruz, Javier, and Ricardo Ruiz-Villaverde. “The ‘5R + R’ Rule: A Simple and Comprehensive Method for Diagnosis of Actinic Keratosis”. Sultan Qaboos University Medical Journal 19, no. 1 (May 30, 2019): e81–82. Accessed May 3, 2024. https://journals.squ.edu.om/index.php/squmj/article/view/3129.