authors.affiliation: Servicio de Cirugía General y Aparato Digestivo, Hospital Universitario Central de la Defensa Gómez-Ulla, Universidad de Alcalá de Henares, Madrid, España. Electronic address: jesusmanuelper@msn.com.
authors.forename: Jesús Manuel
authors.initials: JM
authors.lastname: Peraza-Casajús
authors.forename: Ignacio
authors.initials: I
authors.lastname: Bodega Quiroga
authors.forename: Miguel Ángel
authors.initials: MA
authors.lastname: Sierra Ortega
authors.forename: Angeles
authors.initials: A
authors.lastname: Izquierdo