Sperling RA, Guttmann CRG, Hohol MJ, Warfield SK, Jakab M, Parente M, Diamond EL, Daffner KR, Olek MJ, Orav EJ, Kikinis R, Jolesz FA, Weiner HL. Regional Magnetic Resonance Imaging Lesion Burden and Cognitive Function in Multiple Sclerosis: A Longitudinal Study. Arch Neurol. 2001;58(1):115–21.