Central Vein Sign in Multiple Sclerosis: A Comparison Study of the Diagnostic Performance of 3T versus 7T MRI ============================================================================================================= * Lela Okromelidze * Vishal Patel * Rahul B. Singh * Alfonso S. Lopez Chiriboga * Shengzhen Tao * Xiangzhi Zhou * Sina Straub * Erin M. Westerhold * Vivek Gupta * Amit K. Agarwal * John V. Murray * Amit Desai * S.J.S. Sandhu * I. Vanessa Marin Collazo * Erik H. Middlebrooks