Beltran Gárate, B., M. Huamán Guerrero, F. Osores Plenge, A. Palomino Portilla, A. Yabar Berrocal, E. Cotrina Montenegro, A. Gallo López, and M. Lopez Hilasaca. “High-Risk Human Papilloma Virus in Squamous Cell Esophageal Cancer: A Retrospective Clinicopathologicalstudy from 2003 to 2006 in Edgardo Rebagliati-Martins Hospital, EsSalud, Lima, Peru”. ACTA MEDICA PERUANA, Vol. 26, no. 2, June 2009, pp. 83 -85, http://54.39.98.165/index.php/AMP/article/view/1499.