1. Neuroscience and Mental Health Institute; Faculty of Medicine and Dentistry; University of Alberta; Edmonton AB T6G 2S2 Canada
2. Department of Surgery; Division of Plastic Reconstructive Surgery; 5549A The Hospital for Sick Children; 555 University Avenue Toronto ON M5G 1X8 Canada
3. ICORD (International Collaboration on Repair Discoveries); Blusson Spinal Cord Centre; 818 W. 10th Avenue Vancouver BC V5Z 1M9 Canada
4. Departments of Zoology and Surgery; University of British Columbia; Vancouver BC Canada