Specialli, DS, Correa, JCF, Luna, NM, Brant, R, Greve, JMD, de Godoy, W, Baker, RJ, Lucareli, PRG, "Validation of GDI, GPS and GVS for use in parkinson's disease through evaluation of effects of subthalamic deep brain stimulation and levodopa", Gait & Posture, 2014