Data of 3 month, 6 month and 12 month post-op were: Vmax ~ 289.4 ml, ~ 356.7 ml and ~ 426.7 ml; Pdet max ~ 35.8 cm H2O, ~ 25.4 cm H2O and ~ 32.4 cm H2O; Residual urines ~ 228.9 ml, ~ 312.8 ml and ~ 404.3 ml.