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Khalil HA, van Best JA, de Keizer RJ.Khalil HA, et al. Among authors: de keizer rj.Doc Ophthalmol. 1989 Nov;73(3):249-54. doi: 10.1007/BF00155094.Doc Ophthalmol. 1989.PMID: 2638243
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Kuppens EV, van Best JA, Sterk CC, de Keizer RJ.Kuppens EV, et al. Among authors: de keizer rj.Am J Ophthalmol. 1995 Jul;120(1):41-6. doi: 10.1016/s0002-9394(14)73757-2.Am J Ophthalmol. 1995.PMID: 7611328
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