1. Department of Neurology, Dongguk University Ilsan Hospital, Goyang, Korea.
2. Department of Neurology, Research Institute and Hospital of National Cancer Center, Goyang, Korea.
3. Department of Ophthalmology, Dongguk University Ilsan Hospital, Goyang, Korea.
4. Department of Occupational and Environmental Medicine, Dongguk University Ilsan Hospital, Goyang, Korea.
5. Department of Neurology, Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea.