R. Franco Herrera, M. Cuadrado Ayuso, A. Sanchez Arteaga, D. Alías Jimenez, J. Ruíz Tovar, and J. Lago Oliver, “Do cytology, genotyping, and high resolution anoscopy allow to establish a protocol for early detection of squamous cell carcinoma of the anal canal in risk population?”, Rev Cir., vol. 70, no. 6, Dec. 2018.