IL6 and pterygium: The relationship between (I) the pre-OP cytokine production (IL-6, IL-8, and VEGF), (II) the vascularization index, and (III) the area which was determined in patients with PPt (Supplementary ) and RPt (Supplementary ) and all pterygium patients as a group (n eyes = 21, PPt+RPt, Figure 2).