1. Centre for Neuroregeneration, University of Edinburgh, Chancellor's Building, 49 Little France Crescent, Edinburgh EH16 4SB, UK
2. Faculty of Medical Sciences, Teikyo University of Science, 2-2 Senju-Sakuragi, Adachi-ku, Tokyo 120-0045, Japan
3. Department of Neurology and Neuroscience, Teikyo University, 2-11-1 Kaga, Itabashi-ku, Tokyo 173-8605, Japan