- Correspondence to: T Oshika Department of Ophthalmology, Institute of Clinical Medicine, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8575, Japan;
- Accepted 2 September 2006
- Published in print 1 January 2007.
- Published online 18 December 2006.
- Published first 14 September 2006.
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