1. From the Department of Neurology, CHA Bundang Medical Center, CHA University, Seongnam, Republic of Korea (J.K.)
2. Wake Forest School of Medicine, Wake Forest University, Winston-Salem, NC (C.D.B.)
3. Biostatistics Collaboration Unit, Yonsei University College of Medicine, Seoul, Republic of Korea (H.S.L.)
4. Department of Neurology, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Republic of Korea (S.W.H.).