title: Reply by the authors.
authors.affiliation: Department of Urology, Instituto Nacional de Ciencias Medicas y Nutricion Salvador Zubiran, Mexico City, Mexico.
authors.forename: Daniel
authors.initials: D
authors.lastname: Olvera-Posada
authors.affiliation: Department of Urology, Instituto Nacional de Ciencias Medicas y Nutricion Salvador Zubiran, Mexico City, Mexico.
authors.forename: Francisco
authors.initials: F
authors.lastname: Rodriguez-Covarrubias
mesh_terms: D004646:Emphysema / Q000601:surgery*; D006801:Humans; D011704:Pyelonephritis / Q000601:surgery*