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J M Seddon
Epidemiology Unit, Massachusetts Eye and Ear Infirmary, Boston 02114.
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K M Egan
Epidemiology Unit, Massachusetts Eye and Ear Infirmary, Boston 02114.
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Y Zhang
Epidemiology Unit, Massachusetts Eye and Ear Infirmary, Boston 02114.
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E J Gelles
Epidemiology Unit, Massachusetts Eye and Ear Infirmary, Boston 02114.
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R J Glynn
Epidemiology Unit, Massachusetts Eye and Ear Infirmary, Boston 02114.
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C A Tucker
Epidemiology Unit, Massachusetts Eye and Ear Infirmary, Boston 02114.
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E S Gragoudas
Epidemiology Unit, Massachusetts Eye and Ear Infirmary, Boston 02114.