Time to Understand the Infrequency of the Frequent Exacerbator Phenotype in COPD

Affiliations

• ¹ Division of Pulmonary and Critical Care Medicine, University of Michigan, Ann Arbor, MI.
• ² Division of Pulmonary and Critical Care Medicine, University of Michigan, Ann Arbor, MI; Division of Pulmonary and Critical Care Medicine, Weill Cornell Medical College, New York, NY. Electronic address: fjm2003@med.cornell.edu.