Efficacy of sacral nerve stimulation for urinary retention:results 18 months after implantation. - Jonas,U.; Fowler,C.J.; Chancellor,M.B.; Elhilali,M.M.; Fall,M.; Gajewski,J.B.; Grunewald,V.; Hassouna,M.M.; Hombergh,U.; Janknegt,R.; van Kerrebroeck,P.E.; Lylcklama a Nijeholt,A.A.; et al. (J Urol, 2001)