RT Journal Article SR Electronic T1 The Independent Payment Advisory Board JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 1066 OP 1069 DO 10.3174/ajnr.A3736 VO 35 IS 6 A1 Hirsch, J.A. A1 Donovan, W.D. A1 Barr, R.M. A1 Nicola, G.N. A1 Rosman, D.A. A1 Schaefer, P.W. A1 Manchikanti, L. YR 2014 UL http://www.ajnr.org/content/35/6/1066.abstract