1. Antonetti DA, Klein R, Gardner TW (2012) Diabetic retinopathy. N Engl J Med 366(13):1227–1239
2. Centers for Disease Control and Prevention (2011) National Diabetes Fact Sheet: national estimates and general information on diabetes and prediabetes in the United States. 2011. Available at: www.www.cdc.gov/diabetes/pubs/pdf/ndfs_2011.pdf. Accessed 15 Apr 2015
3. Bhagat N, Grigorian RA, Tutela A, Zarbin MA (2009) Diabetic macular edema: pathogenesis and treatment. Surv Ophthalmol 54(1):1–32
4. Wirostko B, Wong TY, Simo R (2008) Vascular endothelial growth factor and diabetic complications. Prog Retin Eye Res 27(6):608–621
5. Vinores SA, Youssri AI, Luna JD, Chen YS, Bhargave S, Vinores MA, Schoenfeld CL, Peng B, Chan CC, LaRochelle W, Green WR, Campochiaro PA (1997) Upregulation of vascular endothelial growth factor in ischemic and non-ischemic human and experimental retinal disease. Histol Histopathol 12(1):99–109