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(A) Scatter plot of the expiratory diameter of the inferior vena cava (IVC) against body mass index (BMI) of all individuals; a strong correlation (r = 0.686) was observed; (B) Scatter plot of the inspiratory diameter of the inferior vena cava (IVC) against body mass index (BMI) of all individuals; a strong correlation (r = 0.700) was observed.
