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Flow diagram for the main derivation cohort. Of the 369 patients with CLD and suspected PH who were referred to the Cardio-Pulmonary Circulation Center of Shanghai Pulmonary Hospital within the study period, 107 met the inclusion criteria and were considered in the analysis.
Abbreviations: CLD, chronic lung disease; PH, pulmonary hypertension; RHC, right heart catheterization; DE, Doppler echocardiography.
