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Previous Volume 341:1394-1395 October 28, 1999 Number 18 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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To the Editor: Socié et al. (July 1 issue)¹ reported on the long-term survival of patients who have undergone allogeneic bone marrow transplantation and the rate of death more than two years after transplantation. They provided information on the characteristics and outcomes of long-term survivors after bone marrow transplantation, but the study was a retrospective survey in which data were collected by sending questionnaires to many institutions. We agree that a retrospective survey is a powerful method for collecting a large amount of information, but the results may be easily biased because it is difficult to collect complete data on . . . [Full Text of this Article]

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