Leucine 7 to proline 7 polymorphism in the neuropeptide y gene is associated with retinopathy in Type 2 diabetes - Niskanen, L; Voutilainen-Kaunisto, R; Teräsvirta, M; Karvonen, M K; Valve, R; Pesonen, U; Laakso, M; Uusitupa, M I.J.; Koulu, M (Experimental and Clinical Endocrinology & Diabetes, 2000)