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The British Journal of Ophthalmology|February 1, 1987
Public health ophthalmologyC Kupfer
American Journal of Ophthalmology|April 1, 1975
Cooperative clinical trials. The Second Ticho Memorial LectureC Kupfer
Japanese Journal of Ophthalmology|January 1, 1982
Randomized clinical trialC Kupfer
Bulletin of the World Health Organization|January 1, 1995
Strategic issues in preventing cataract blindness in developing countriesL B Ellwein, C Kupfer
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