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R. H. ALLEN
Division of Hematology, Department of Medicine, University of Colorado Health Sciences Center
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S. P. STABLER
Division of Hematology, Department of Medicine, University of Colorado Health Sciences Center
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D. G. SAVAGE
Department of Medicine, Columbia University College of Physicians and Surgeons, New York
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J. LINDENBAUM
Department of Medicine, Columbia University College of Physicians and Surgeons, New York