aDepartment of Neurology, Korea University Medical Center, Seoul, Korea.
bDepartment of Neurology, Seoul National University College of Medicine, Seoul, Korea.
cDepartment of Neurology, Incheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Incheon, Korea.
dDepartment of Neurology, Korea University College of Medicine, Seoul, Korea.
eDepartment of Neurology, Soonchunhyang University Bucheon Hospital, Bucheon, Korea.
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