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pressure model urethra urethral obstruction bladder outlet obstruction withdrawal rate bladder perfusion flow rate noise recording perfusion rate withdrawal pressure zone pig urethra cuv pressure study catheter pig urethras silicone tubes diverent method degree model urethras urethral model bladder pressure frequency function patient model urethra measurement figure hypospadia silicone length pva-urethra property urethral wall £ ow rate increase hypospadias model outlet 10 ml /min strain control model water segment diverent withdrawal rates 0.5 mm /s urethral closure pressure power spectrum distance stress prowle combination diameter idzenga power value microphone wall-sti ¡ness mastrigt signi ¢cantly level roc curve relation noise recording freeze-thaw cycles volume polyvinyl alcohol diverent perfusion rates closure urethral pressure prowlometry pressure zone length pressure response xow rate correlation int urogynecol j freeze-thawed
