- Dr Yukihiko Mashima, Department of Ophthalmology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160, Japan. Telephone 0081 3 3353 1211 ext 2402; fax: 0081 3 3359 8302.
- Received February 20, 1997
- Revised July 11, 1997
- Accepted July 23, 1997
- First published January 1, 1998.
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