RT Journal Article SR Electronic T1 Degenerative cervical myelopathy JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E116 OP E116 DO 10.1503/cmaj.151478 VO 189 IS 3 A1 Christopher D. Witiw A1 Michael G. Fehlings YR 2017 UL http://www.cmaj.ca/content/189/3/E116.abstract