Xiao's skin-CNS-bladder transfer procedure is now being done here in the states - in New York I believe. (I'll have to dig up the web page for you). Appears to have pretty good success. Mackinnon at Wash U is also a very innovative nerve surgeon who appears to get very good results. Livshits does a variation of Xiao's procedure using intercostals. I didn't see the same numbers with his procedure, but the advantage would be volitional control as opposed to requiring skin stimulation to initiate the reflex