[1] Univ Calif San Francisco, Dept Neurol Surg, Brain & Spinal Injury Ctr BASIC, San Francisco, CA USA
[2] Natl Rehabil Ctr Persons Disabil, Res Inst, Dept Rehabil Movement Funct, Saitama, Japan
[3] Univ Pittsburgh, Dept Phys Med & Rehabil, Pittsburgh, PA USA
[4] Univ Tokyo, Fac Med, Dept Orthopaed Surg, Tokyo 113, Japan