3598178 VFTs verbal fluency tasks 28 3598189 VFTs variable-frequency trains 5 3598187 VFTs ventricular fibrillation thresholds 4 3598179 VFTs Virtual Field Trips 4 3598177 VFTs vocal facilitating techniques 4 3598184 VFTs vestibular function tests 3 3598190 VFTs variable frequency, short-duration trains 1 3598180 VFTs Variable-frequency stimulation trains 1 3598188 VFTs vascular function tests 1 3598182 VFTs Ventilatory function tests 1 3598181 VFTs VF tests 1 3598186 VFTs visual field testings 1 3598185 VFTs visuomotor and functional tests 1