Two-Staged Sacral Neuromodulation for the Treatment of Nonobstructive Urinary Retention: A Multicenter Study Assessing Predictors of Success. - Coolen RL; Groen J; Stillebroer AB; Scheepe JR; Witte LPW; Blok BFM (Neuromodulation : journal of the International Neuromodulation Society, 2023)