title: Retraction note: The prevalence of obstructive sleep apnea in patients with difficult-to-treat asthma.
abstract: This original article, published in the Asian Pacific Journal of Allergy and Immunology, has been retracted from this journal based on an error in the analysis included a patient who has not given informed consent. The authors could not be contacted to provide the explanation. Due to the nature of the error, the Editor-in-Chief and the Associate Editors have decided to retract this article although this error does not affect the validity of the study. We apologize for any adverse consequences this may have caused.