Sources of Disparity in Incidence and Prevalence Studies of Diabetic Retinopathy: Influence of Selective Survival on Risk Factor Assessment

David J Ballard, MD;

David J Ballard, MD

Department of Medical Statistics and Epidemiology, Mayo Clinic and Mayo Foundation

Rochester, Minnesota 55905

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L Joseph Melton, III, MD

Department of Medical Statistics and Epidemiology, Mayo Clinic and Mayo Foundation

Rochester, Minnesota 55905

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Address reprint requests to Dr. David J. Ballard at the above address.