Published: 31 October 2019
Author(s): Guizuo Wang, Wenli Shang, Yajuan Ren, Sining Liu, Xiaoping Ren, Shenghong Wei, Dong Han
Issue: October 2019
Section: Original article

Chronic obstructive pulmonary disease (COPD) with its comorbidities is one of the five major causes of death worldwide [1]. Pulmonary hypertension (PH) is a serious condition classified into five groups based on its pathogenesis, with Group 3 due to lung diseases and/or hypoxia [2].

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