1. Department of Ophthalmology, Kansai Medical University, Moriguchi, Japan.
2. Department of Emergency and Critical Care Medicine, Kansai Medical University, Moriguchi, Japan.
3. Department of Neurology, Kansai Medical University, Moriguchi, Japan.
4. Department of Ophthalmology, Kyoto-Katsura Hospital, Kyoto, Japan.