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Gardner TW, Larsen M, Girach A, Zhi X; Protein Kinase C Diabetic Retinopathy Study (PKC-DRS2) Study Group.Gardner TW, et al. Among authors: larsen m.Acta Ophthalmol. 2009 Nov;87(7):709-13. doi: 10.1111/j.1755-3768.2009.01545.x. Epub 2009 Oct 8.Acta Ophthalmol. 2009.PMID: 19817721Free article.Clinical Trial.