[1] Univ Tubingen, Ctr Ophthalmol, D-72076 Tubingen, Germany
[2] Univ New Sourth Wales, St Vincents Eye Clin, Sydney, NSW, Australia
[3] Univ New Sourth Wales, Sch Med Sci, Sydney, NSW, Australia
[4] Stanford Univ, Sch Med, Stanford, CA 94305 USA
[5] Calif Pacific Med Ctr, San Francisco, CA USA
[6] Moorfields Eye Hosp, London, England
[7] Univ Bern, Bern, Switzerland
[8] Swiss Eye Inst, Bern, Switzerland