[1] Washington Univ, Sch Med, Dept Neurol,Spinal Cord Injury Neurorehabil Sect, Restorat Treatment & Res Ctr, St Louis, MO 63110 USA
[2] Washington Univ, Sch Med, Restorat Treatment & Res Program, St Louis, MO 63110 USA
[3] Washington Univ, Sch Med, Dept Neurol Surg, St Louis, MO 63110 USA