WITHDRAWN: Respiratory Disability and Static Hyperinflation Were Associated with Frequent Exacerbator Status in Patients with Severe COPD

The publisher regrets that an error occurred due to a technical issue which led to the premature publication of this paper. This error bears no reflection on the article or its authors. The publisher apologizes to the authors and the readers for this unfortunate error. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy.