... significance between the pre-pandemic period of March 1, 2019, through February 29, 2020, and during the COVID ...
... -19 pandemic period of March 1, 2020, through February 28, 2021. This study will increase the ...
... States in 2020. This syndrome, Sars-CoV2, which became known as the coronavirus 2019, or COVID-19, has a ...
... underlying cardiac or pulmonary disease (Wang et al., 2020). Patients with pulmonary arterial hypertension ...
... declared by the World Health Organization on January 30, 2020 (Hu et al., 2020). The COVID-19 virus is ...
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