Vitreous levels of pigment epithelium-derived factor and vascular endothelial growth factor: implications for ocular angiogenesis.
Duh EJ, Yang HS, Haller JA, De Juan E, Humayun MS, Gehlbach P, Melia M, Pieramici D, Harlan JB, Campochiaro PA, Zack DJ. Vitreous levels of pigment epithelium-derived factor and vascular endothelial growth factor: implications for ocular angiogenesis. Am J Ophthalmol. 2004 Apr; 137(4):668-74.