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Flow chart visualising identification of publications, inclusion and exclusion criteria, and selection of publications eligible for meta-analysis. a) Biomarker search; b) omics search. #: excluding conference abstracts; ¶: transcriptomics, proteomics, metabolomics, glycomics and lipidomics. iPAH: idiopathic pulmonary arterial hypertension; hPAH: hereditary pulmonary arterial hypertension.
