1. From the Departments of Anatomy and Cell Biology and
2. Ophthalmology, Martin Luther University of Halle-Wittenberg, Halle/Saale, Germany; the
3. Department of Ophthalmology, Christian Albrecht University of Kiel, Kiel, Germany;
4. Charite^, Department of Ophthalmology, Berlin, Germany; and the
5. Department of Anatomy, University of Bern, Bern, Switzerland.