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I agree it would be discouraging. Hopefully technical advances in MRI will soon eliminate any flow sensitivity issues. Also, yes, I think sample size was probably an issue; especially with the control group.

I believe it's true that you cannot use this study to make a confident claim that azygos blood flow is equal between MS patients and healthy controls; however, you cannot also assume that Dr. Tai is making that claim. She performed a study and published the results. That's all. If she came out and s...