From the Departments of Pathology, Urology, and Oncology, The Johns Hopkins Hospital, Baltimore, Maryland, U.S.A. Address correspondence and reprint requests to Jonathan I. Epstein, MD, Johns Hopkins Hospital, Department of Pathology, 600 N. Wolfe St., Baltimore, MD 21287, U.S.A.
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Jonathan I. Epstein (2000) studied this question.
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