1. Duh E, Chung N, Wong T. Diabetic retinopathy and systemic complications. In: Duh E, editor. Diabetic retinopathy. New Jersey: Humana Press; 2009. p. 465–82.
2. Cheung N, Mitchell P, Wong T. Diabetic Retinopathy. Lancet. 2010;376:124–36.
3. NHS Centre for Reviews and Dissemination (NHS CRD). Complications of diabetes: screening for retinopathy, management of foot ulcers. E Health Care. 1999;5:1–12. Available at http://www.york.ac.uk/inst/crd/EHC/ehc54.pdf
4. Early Treatment Diabetic Retinopathy Study Research Group. Fundus photographic risk factors for progression of diabetic retinopathy. ETDRS report number 12. Ophthalmology. 1991;98:823–33.
5. Tanner V. Diabetic retinopathy. In: Kanski JJ, editor Clinical ophthalmology—a systematic approach. Philadelphia: Elsevier, 2007; 573.