Graefe's Archive for Clinical and Experimental OphthalmologyApril 2003, Volume 241, Issue 4, pp 343–346 | Cite asApril 2003AnnouncementsFirst Online: 16 April 2003 30 Downloads This is a preview of subscription content, log in to check access.PreviewUnable to display preview. Download preview PDF.Unable to display preview. Download preview PDF.Copyright information© Springer-Verlag 2003