1. Department of Ophthalmology, Tokyo Dental College Ichikawa General Hospital, Chiba, Japan;
2. Department of Ophthalmology, Shinshu University School of Medicine, Nagano, Japan;
3. Cornea Center and Eye Bank, Tokyo Dental College, Ichikawa General Hospital, Chiba, Japan; and
4. Department of Ocular Pathology and Imaging Science, Graduate School of Medical Sciences, Kyushu University, Hakata, Japan.