From the Department of Pediatrics, University of Virginia College of Medicine, Charlottesville, Virginia, U.S.A. Submitted for publication October 26, 2000; accepted January 3, 2001. Address correspondence and reprint requests to Dr. Pedro de Alarcon, University of Virginia College of Medicine, Department of Pediatrics—CMC, Box 386, Charlottesville, VA 22908.
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J.A. Stockman (2001) studied this question.
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