1. St Paul's Eye Unit Royal Liverpool University Hospital Liverpool UK
2. Vall d'Hebron Research Institute (VHIR) and Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM) Barcelona Spain
3. Lund University Hospital Lund Sweden
4. St. Michael's Hospital, University of Toronto Toronto Canada
5. University Hospital Llandough, Llandough Wales UK