F. Sharifiaghdas, M. Mirzaei, and babak Ahadi, “Percutaneous Nerve Evaluation (PNE) for Treatment of Non-Obstructive Urinary Retention: Urodynamic Changes, Placebo Effects, and Response Rates”, Urol J, vol. 11, no. 1, pp. 1301–1307, Mar. 2014.