Thirty MS women were randomly allocated to one of three groups : pelvic floor muscle training ( PFMT ) with electromyographic ( EMG ) biofeedback and sham neuromuscular electrostimulation ( NMES ) ( Group I ) , PFMT with EMG biofeedback and intravaginal NMES ( Group II ) , and PFMT with EMG biofeedback and transcutaneous tibial nerve stimulation ( TTNS ) ( Group III ) .