This cross-sectional study was conducted between March 1, 2020, and June 30, 2020, at the cardiology department of An-Najah National University Hospital (NNUH), Nablus, Palestine. A convenience sample of 40 healthy nonsmoking males and females aged 18–40 years was randomly selected to be enrolled in this study. Subjects had to meet the following criteria to be included in the study: age 18–40 years, healthy, specifically with no history of previous cardiovascular or respiratory disease, and nonsmoker. Subjects who did not meet the inclusion criteria and those with any concomitant cardiovascular disease were excluded. All participants provided written informed consent for participation in the study. The Institutional Review Board of An-Najah National University approved the study.

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