[1] Inje Univ, Dept Pediat, Sanggye Paik Hosp, Coll Med, Seoul 139707, South Korea
[2] Inje Univ, Epilepsy Ctr, Sanggye Paik Hosp, Coll Med, Seoul 139707, South Korea
[3] Univ Ulsan, Dept Pediat, Asan Med Ctr, Coll Med, Seoul 138736, South Korea
[4] Univ Ulsan, Dept Psychiat, Asan Med Ctr, Coll Med, Seoul 138736, South Korea