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What could the DASH trial 1997 have done differently?

Hello! I am currently critiquing ' A Clinical Trial of the Effects of Dietary Patterns on Blood Pressure' as I am trying to recreate something similar of course on a smaller.

I was wondering what they could done differently to improve the trial particularly the study design?

Or even what is wrong with the paper or the trial? 

I have also linked the original paper:

https://www.nejm.org/doi/full/10.1056/nejm19970417...

Thank you for your time. 

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