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James K Stoller MD, Head. Section of Respiratory Therapy, Department of Pulmonary and Critical Care Medicine, The Cleveland Clinic Foundation. Cleveland, Ohio

Reprints and Correspondence: James K Stoller MD, Department of Pulmonary and Critical Care Medicine. A90. The Cleveland Clinic Foundation, 9500 Euclid Ave. Cleveland OH 44l95. stollej@cesmtp.ccf.org.

*From the Department of Pulmonary and Critical Care Medicine, The Cleveland Clinic Foundation. Cleveland, Ohio

*The American Association for Respiratory Care. Clinical Practice Guidelines. Respir Cure 996; 41(7):628.