Table 1. Statistics of highly cited English DR publication (Top 5).

Study	Title	Cited frequency
DCCT Research Group et al, 1993[8]	The effect of intensive treatment of diabetes on the development and progression of long-term complications in insulin-dependent diabetes mellitus	16969
UKPDS Group, 1998[9]	Intensive blood-glucose control with sulphonylureas or insulin compared with conventional treatment and risk of complications in patients with type 2 diabetes (UKPDS 33)	13828
UKPDS Group, 1998[10]	Tight blood pressure control and risk of macrovascular and microvascular complications in type 2 diabetes: UKPDS 38	5503
Ferrara and Davis-Smyth, 1997[11]	The biology of vascular endothelial growth factor	3473
Yancopoulos et al, 2000[12]	Vascular-specific growth factors and blood vessel formation	2835

DR: Diabetic retinopathy.