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Relationship between 6-minute walk distance (6MWD) by Ln(DHEA-S) levels and Ln(2-ME) levels in pulmonary arterial hypertension cases (red cross) and controls (blue pyramids) over time (visits 1, 2, 3, 4); 180° rotation is provided for interpretation. 2-ME = 2-methoxyestrone; DHEA-S = dehydroepiandrosterone sulfate.
