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Ludwig K, Bechmann M, Welge-Lüssen U, Kenyon KR, Hoops J, Kampik A.Ludwig K, et al. Among authors: kenyon kr.Ophthalmologe. 2002 May;99(5):384-9. doi: 10.1007/s003470100529.Ophthalmologe. 2002.PMID: 12043295German.