RT Journal Article SR Electronic T1 The future of stem cells in neurodegenerative disorders of the central nervous system JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 631 OP 632 DO 10.1503/cmaj.110525 VO 184 IS 6 A1 Roger A. Barker YR 2012 UL http://www.cmaj.ca/content/184/6/631.abstract