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R L Steinmetz
Department of Clinical Ophthalmology, Institute of Ophthalmology, London, England.
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P C Polkinghorne
Department of Clinical Ophthalmology, Institute of Ophthalmology, London, England.
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F W Fitzke
Department of Clinical Ophthalmology, Institute of Ophthalmology, London, England.
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C M Kemp
Department of Clinical Ophthalmology, Institute of Ophthalmology, London, England.
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A C Bird
Department of Clinical Ophthalmology, Institute of Ophthalmology, London, England.