Independent contributions of cortical gray matter atrophy and ventricle enlargement for predicting neuropsychological impairment in multiple sclerosis. - Ayda Tekok-Kilic; Ralph H. B. Benedict; Bianca Weinstock-Guttman; Michael G. Dwyer; Dominic Carone; Bhooma Srinivasaraghavan; Viritha Yella; Nadir Abdelrahman; Frederick Munschauer; Rohit Bakshi; Robert Zivadinov (NeuroImage, 2007)