This is because the sample size is small and some specific characters are required.
The inclusion and exclusion criteria were indicated. I acknowledged that this might led to the limitation for finding generalisation.
Sumanta Chakraborty
Better not to...if in any case you have to do it better term it as a quasi experimental clinical trial.
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David L Morgan
If you want to have separate experimental and control groups, you can use "random assignment" from the original sample. But be sure your overall sample size is large enough to ensure that you have the power to detect significance. If you are not familiar with assessing the power of a test, the most widely used tool is g*Power
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