Letter to the EditorObstructive sleep apnea syndrome and secondary polycythemia: analysis of the nationwide inpatient sample
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Conflict of interest
The authors of this paper have no conflicts of interest, including specific financial interests, relationships, and/ or affiliations relevant to the subject matter or materials included.
The ICMJE Uniform Disclosure Form for Potential Conflicts of Interest associated with this article can be viewed by clicking on the following link: http://dx.doi.org/10.1016/j.sleep.2014.09.012.
Acknowledgments
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2018, American Journal of CardiologyCitation Excerpt :We also excluded patients who were transferred to another hospital, to reduce the risk of duplication (see Figure 1 for study flow diagram). The study identified patients with OSA as primary or secondary diagnoses using the International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) codes (327.23) as described elsewhere.12,13 We divided the study subjects into 2 groups, OSA versus no OSA.
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