a) Comparison of mean flow (mL/min) between MS and HC groups at both the C2/C3 and C5/C6 neck levels for LIJV, RIJV and total IJV flow (one standard deviation error bars of the population distribution are shown). This plot is an attempt to replicate the data from the study by Rodger and colleagues [23]. b) Comparison of mean flow between the ST-MS group, NST-MS group, and HC group at both C2/C3 and C5/C6 neck levels for LIJV, RIJV and total IJV flow. In this chart, the bars represent the standard error of the mean. As discussed in the text, there are significant differences between the ST-MS group and the HC for total IJV flow.