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Alaa Abu Sayf, MD Senior Staff Physician, Division of Pulmonary and Critical Care Medicine, Henry Ford Hospital, Wayne State University School of Medicine

Alaa Abu Sayf, MD is a member of the following medical societies: American College of Chest Physicians, American Thoracic Society, Society of Critical Care Medicine

Disclosure: Nothing to disclose.

Daniel R Ouellette, MD, FCCP Associate Professor of Medicine, Wayne State University School of Medicine; Medical Director, Pulmonary Medicine General Practice Unit (F2), Senior Staff and Attending Physician, Division of Pulmonary and Critical Care Medicine, Henry Ford Hospital

Daniel R Ouellette, MD, FCCP is a member of the following medical societies: American College of Chest Physicians, American Thoracic Society, Society of Critical Care Medicine

Disclosure: Received research grant from: Sanofi Pharmaceutical.

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Received salary from Medscape for employment. for: Medscape.

Guy W Soo Hoo, MD, MPH Professor of Clinical Medicine, University of California, Los Angeles, David Geffen School of Medicine; Director, Medical Intensive Care Unit, Chief, Pulmonary, Critical Care and Sleep Section, West Los Angeles VA Healthcare Center, Veteran Affairs Greater Los Angeles Healthcare System

Guy W Soo Hoo, MD, MPH is a member of the following medical societies: American Association for Respiratory Care, American College of Chest Physicians, American College of Physicians, American Thoracic Society, California Thoracic Society, Society of Critical Care Medicine

Disclosure: Nothing to disclose.

Stephen P Peters, MD, PhD, FACP, FAAAAI, FCCP, FCPP Thomas H Davis Chair in Pulmonary Medicine, Chief, Section on Pulmonary, Critical Care, Allergy and Immunologic Diseases, Professor of Internal Medicine, Pediatrics, and Translational Science, Associate Director, Center for Genomics and Personalized Medicine Research, Wake Forest University School of Medicine; Executive Director of the Respiratory Service Line, Wake Forest Baptist Medical Center

Stephen P Peters, MD, PhD, FACP, FAAAAI, FCCP, FCPP is a member of the following medical societies: American Academy of Allergy Asthma and Immunology, American Association of Immunologists, American College of Chest Physicians, American College of Physicians, American Federation for Medical Research, American Thoracic Society, Sigma Xi, The Scientific Research Honor Society

Disclosure: Serve(d) as a speaker or a member of a speakers bureau for: Integrity CE, Merck<br/>Received income in an amount equal to or greater than $250 from: – Array Biopharma, AstraZeneca, Aerocrine, Airsonett AB, Boehringer-Ingelheim, Experts in Asthma, Gilead, GlaxoSmithKline, Merck, Novartis, Ono Pharmaceuticals, Pfizer, PPD Development, Quintiles, Sunovion, Saatchi & Saatichi, Targacept, TEVA, Theron.

Amanda M K Godfrey, MD Associate Staff, Department of Internal Medicine, IHA Pulmonary, Critical Care, and Sleep Consultants; Associate Staff, Department of Internal Medicine, Division of Pulmonary and Critical Care Medicine, St Joseph Mercy Ann Arbor

Amanda M K Godfrey, MD is a member of the following medical societies: American College of Chest Physicians, American College of Physicians, American Medical Association, American Thoracic Society, Michigan State Medical Society

Disclosure: Nothing to disclose.

The authors and editors of Medscape Reference gratefully acknowledge the contributions of previous authors, Rajesh G. Patel, MD, and Javier I. Diaz, MD, to the development and writing of this article.

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