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Feltgen N, Heimann H, Hoerauf H, Walter P, Hilgers RD, Heussen N; Writing group for the SPR study investigators*.Feltgen N, et al. Among authors: hilgers rd.Acta Ophthalmol. 2013 May;91(3):282-7. doi: 10.1111/j.1755-3768.2011.02344.x. Epub 2012 Feb 15.Acta Ophthalmol. 2013.PMID: 22336429Free article.Clinical Trial.