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Figure 1 This flowchart shows the protocol for the recruitment and investigation of the PAPY (PA Prevalence in Hypertensives) study population. AHA = American Heart Association; APA = aldosterone-producing adenoma; ARR = aldosterone/renin ratio; AVS = adrenal vein sampling; CT = computed tomography; IHA = idiopathic hyperaldosteronism; LDF = logistic discriminant analysis; MR = magnetic resonance.