You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "which disorder involves the retrograde passage of infected urine?" whose answer is Vesicoureteral reflux (VUR).
Each document should contain about 30 words, and these documents should contain useful information.

Query: retrograde passage of infected urine disorder
Useful Output:

Doc 1: Eventual loss of renal function may be related to the duration of hydronephrosis, associated urinary tract infection (UTI), previous surgery and
Doc 2: Our results indicate that extended operative time and increased stone size may be risk factors for infectious complications after RIRS.
Doc 3: Vesicoureteral reflux (VUR) is a congenital defect of the ureterovesical junction that leads to the retrograde passage of urine from the bladder
Doc 4: Conclusion Retrograde ureteric stenting is safe and effective in infected obstructed kidneys.Results are comparable to percutaneous nephrostomy
Doc 5: Retrograde intrarenal surgery (RIRS) performed using a flexible instrument passed through the lower urinary tract and ureter in the