1. Department of Vitreoretinal Surgery and Angiogenesis LaboratoryCenter of OphthalmologyUniversity of CologneKölnGermany
2. Center for Molecular Medicine (ZMMK) University of CologneKölnGermany
3. Retina Research LaboratoryMassachusetts Eye and Ear Infirmary, Harvard Medical SchoolBostonMassachusetts
4. Laboratory for Surgical ResearchChildren's Hospital, Harvard Medical SchoolBostonMassachusetts
5. Departments of Medicine and Ophthalmology and Center for Diabetes ResearchCase Western Reserve UniversityClevelandOhio
6. Eyetech Research CenterWoburnMassachusetts