1 Department of Ophthalmology and Visual Science, Graduate School of Medical and Dental Sciences, Niigata University, 1-757 Asahimachido-Ri, Chuo-Ku, Niigata, 951-8510, Japan. iryoko@med.niigata-u.ac.jp.
2 Department of Ophthalmology and Visual Science, Graduate School of Medical and Dental Sciences, Niigata University, 1-757 Asahimachido-Ri, Chuo-Ku, Niigata, 951-8510, Japan.