Po-Jen Hsu1, Chung-Wei Lee1, Sung-Chun Tang2, Jiann-Shing Jeng1. 1. From the Departments of Neurology (P.-J.H., S.-C.T., J.-S.J.) and Medical Imaging (C.-W.L.), National Taiwan University Hospital, Taipei. 2. From the Departments of Neurology (P.-J.H., S.-C.T., J.-S.J.) and Medical Imaging (C.-W.L.), National Taiwan University Hospital, Taipei. tangneuro@gmail.com.