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(a) US B-mode images: delineations of edge between lumen and mucosal boundaries to measure luminal CSA, for swallowed bolus volumes of 5, 10 and 15ccs, (b) Boxplot showing the distribution of mean US CSA across the three volumes (*p<0.05), (c) Identity relation for two US duplicates measurements, (d) Bland–Altman plots for the pair-wise comparisons of two US CSA measurements, mean differences (solid line) and 2SD limits (dashed lines).
