1. Division of Ophthalmology and Visual Science, Graduate School of Medical and Dental Sciences, Niigata University, Asahimachi-dori 1-757, Chuo-ku, Niigata 951-8510, Japan
2. Imai Eye Clinic, Honcho 3-2-1, Niigata 957-0054, Japan
3. Hanyu Clinic, Igarashi-higashi 1-1-15, Nishi-ku, Niigata 950-2045, Japan
4. Department of Psychiatry, Graduate School of Medical and Dental Sciences, Niigata University, Asahimachi-dori 1-757, Chuo-ku, Niigata 951-8510, Japan
5. Department of Ophthalmology, Kawasaki Medical School, Matsushima 757, Okayama 701-0192, Japan