What’s the Difference Anyway?
“.” Annals of the American Thoracic Society, 21(4), pp. 663–668 Correspondence and requests for reprints should be addressed to Andrew M. Luks, M.D., Division of Pulmonary, Critical Care, and Sleep Medicine, Harborv iew Medical Center and the University of Washington, 325 Ninth Avenue, Box 359762, Seattle, WA 98104. E-mail: [email protected]. Not Yet Registered? Benefits of Registration Include: • A Unique User Profile that will allow you to manage your current subscriptions (including online