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From the Division of Pulmonary and Critical Care Medicine, Stanford University, Stanford, CA. This study was supported, in part, by the Mr. and Mrs. Samuel Reeves and Family Fund. Address requests for reprints to: Thomas A. Raffin, MD, Division of Pulmonary and Critical Care Medicine, Stanford University Medical Center, 300 Pasteur Drive, Room H3151, Stanford, CA 94305-5236.
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Gilligan et al. (1996) studied this question.
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