1. Department of Orthoptics, Faculty of Rehabilitation, Kawasaki University of Medical Welfare, Kurashiki, Okayama, Japan
2. Department of Ophthalmology, Kawasaki Medical School, Okayama, Japan
3. Department of Neurology, The Jikei University School of Medicine, Tokyo, Japan
4. Department of Neurology, Graduate School of Medicine, Nippon Medical School, Tokyo, Japan
5. Department of Stroke Medicine, Kawasaki Medical School, Okayama, Japan