title: Reply by the authors.
authors.affiliation: Department of Urology, Urology and Nephrology Center, Mansoura University, Mansoura, Egypt.
authors.forename: Ahmed R
authors.initials: AR
authors.lastname: El-Nahas
authors.affiliation: Department of Urology, Urology and Nephrology Center, Mansoura University, Mansoura, Egypt.
authors.forename: Nasr A
authors.initials: NA
authors.lastname: El-Tabey
authors.affiliation: Department of Urology, Urology and Nephrology Center, Mansoura University, Mansoura, Egypt.
authors.forename: Ahmed M
authors.initials: AM
authors.lastname: El-Assmy
mesh_terms: D005260:Female; D006801:Humans; D007668:Kidney / Q000002:abnormalities* / Q000503:physiopathology*; D007669:Kidney Calculi / Q000601:surgery*; D008297:Male; D009403:Nephrostomy, Percutaneous