Corrigendum: Differential Immunoexpression of Inhibitory Immune Checkpoint Molecules and Clinicopathological Correlates in Keratoacanthoma, Primary Cutaneous Squamous Cell Carcinoma and Metastases This Corrigendum relates to the following article: https://doi.org/10.2340/actadv.v104.13381. … ← The emerging role of Artificial Intelligence in proton therapy: a review Origin and evolution of microvilli →