The Effect of Ruboxistaurin on Visual Loss in Patients With Moderately Severe to Very Severe Nonproliferative Diabetic Retinopathy: Initial Results of the Protein Kinase C [beta] Inhibitor Diabetic Retinopathy Study (PKC-DRS) Multicenter Randomized Clinical Trial. The PKC-DRS Study Group * [Miscellaneous Article] Diabetes. 54(7):2188-2197, July 2005.
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