Dominguez-Cruz J, Ruiz-Villaverde R. The ‘5R + R’ Rule: A simple and comprehensive method for diagnosis of actinic keratosis. Sultan Qaboos Univ Med J [Internet]. 2019May30 [cited 2024Dec.22];19(1):e81-82. Available from: https://journals.squ.edu.om/index.php/squmj/article/view/3129