RT Journal Article SR Electronic T1 Spontaneous regression of a lumbar disk herniation JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 823 OP 823 DO 10.1503/cmaj.091918 VO 183 IS 7 A1 Michael J. Monument A1 Paul T. Salo YR 2011 UL http://www.cmaj.ca/content/183/7/823.abstract