1. The Department of Ophthalmology, California Pacific Medical Center, San Francisco, California, USA,
2. The Department of Ophthalmology, Stanford University School of Medicine, Stanford, California, USA,
3. The Francis I. Proctor Foundation, UCSF School of Medicine, San Francisco, California, USA,
4. Singapore National Eye Centre, Singapore,
5. Duke-National University of Singapore Graduate Medical School Singapore, Singapore,
6. Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore,
7. Singapore Eye Research Institute, Singapore, and
8. Centre for Ophthalmology, University Tuebingen, Schleichstrasse 12, Tuebingen, Germany