1. Department of Neurology; Yonsei University College of Medicine; Seoul Korea
2. Neurovascular Imaging Research Core; University of California; Los Angeles CA
3. Department of Medicine and Therapeutics; Chinese University of Hong Kong; Hong Kong SAR China
4. Department of Biostatistics; Yonsei University College of Medicine; Seoul Korea
5. Department of Neurology, Beijing Tiantan Hospital; Capital Medical University; Beijing China
6. Baystate Medical Center Springfield; MA