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Relationship between mean upper airway cross-sectional area (UAXSA) in response to the graded lower body positive pressure (LBPP) in patients with controlled hypertension (CH) and drug resistant hypertension (DRH). Modified with permission (Friedman O, Bradley TD, Logan AG. Influence of lower body positive pressure on upper airway cross-sectional area in drug-resistant hypertension. Hypertension. 2013;61:240–245).
