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Appen RE, de Venecia G, Ferwerda J.Appen RE, et al.Am J Ophthalmol. 1980 Sep;90(3):352-9. doi: 10.1016/s0002-9394(14)74916-5.Am J Ophthalmol. 1980.PMID: 7425051
Klewin KM, Appen RE, Kaufman PL.Klewin KM, et al. Among authors: appen re.Am J Ophthalmol. 1978 Nov;86(5):669-72. doi: 10.1016/0002-9394(78)90188-5.Am J Ophthalmol. 1978.PMID: 717525