title: Supine valdivia and modified lithotomy position for simultaneous anterograde and retrograde endourological access.
authors.forename: Athanasios G
authors.initials: AG
authors.lastname: Papatsoris
authors.forename: Junaid
authors.initials: J
authors.lastname: Masood
authors.forename: Peter
authors.initials: P
authors.lastname: Saunders
mesh_terms: D006801:Humans; D009403:Nephrostomy, Percutaneous / Q000379:methods*; D016683:Supine Position; D014570:Urologic Diseases / Q000601:surgery*