[1] Univ Calif Los Angeles, Dept Physiol Sci & Neurobiol, Los Angeles, CA 90095 USA
[2] Univ Calif Los Angeles, Brain Res Inst, Los Angeles, CA 90095 USA
[3] Univ Miami, Sch Med, Miami Project Cure Paralysis, Dept Cell Biol & Anat, Miami, FL 33101 USA
[4] Univ Miami, Sch Med, Dept Neurol Surg, Miami, FL 33101 USA
[5] Univ Cambridge, Brain Repair Ctr, Cambridge CB2 2PY, England
[6] Methodist Hosp, Inst Neurol, Dept Neurosurg, Houston, TX 77030 USA
[7] Vanderbilt Univ, Dept Psychol, Nashville, TN 37203 USA
[8] UCL, Inst Neurol, London WC1N 3BG, England
[9] Univ Zurich, Brain Res Inst, CH-8057 Zurich, Switzerland
[10] Columbia Univ, Ctr Neurobiol & Behav, New York, NY 10032 USA
[11] Univ Kansas, Med Ctr, Landon Ctr Aging, Dept Mol & Integrat Physiol, Kansas City, KS 66160 USA
[12] Spanish Council Sci Res, Lab Neural Regenerat, Inst Biomed, Valencia 46010, Spain
[13] Univ Fribourg, Inst Physiol, CH-1700 Fribourg, Switzerland