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Schmidt-Erfurth U, Wolf S; PROTECT Study Group.Schmidt-Erfurth U, et al.Br J Ophthalmol. 2008 Dec;92(12):1628-35. doi: 10.1136/bjo.2007.135277. Epub 2008 Sep 4.Br J Ophthalmol. 2008.PMID: 18772178Clinical Trial.