RT Journal Article SR Electronic T1 Multicenter Validation of Mean Upper Cervical Cord Area Measurements from Head 3D T1-Weighted MR Imaging in Patients with Multiple Sclerosis JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology DO 10.3174/ajnr.A4635 A1 Y. Liu A1 C. Lukas A1 M.D. Steenwijk A1 M. Daams A1 A. Versteeg A1 Y. Duan A1 K. Li A1 F. Weiler A1 H.K. Hahn A1 M.P. Wattjes A1 F. Barkhof A1 H. Vrenken YR 2015 UL http://www.ajnr.org/content/early/2015/12/24/ajnr.A4635.abstract AB Markup server — Error Error There was a problem handling your request. Please try again in a few minutes, or contact us if you continue to experience this problem.