Leucine 7 to proline 7 polymorphism in the neuropeptide y gene is associated with retinopathy in type 2 diabetes. - Niskanen,L.; Voutilainen-Kaunisto,R.; Terasvirta,M.; Karvonen,M.K.; Valve,R.; Pesonen,U.; Laakso,M.; Uusitupa,M.I.; Koulu,M. (Exp Clin Endocrinol Diabetes, 2000)