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Re:A new form of brain stimulation relieved severe depressio... by mcguire on Tuesday April 07, 2020 @03:23PM (#22806562)
I'm sorry your text is grey; this is a valid question.

These are preliminary studies: someone says, "Let me try something," it appears to work, and they report what they saw, with the resources they had.

As a result, someone organizes follow-on studies with more resources, which costs much more. At that point, the effect usually disappears, due to the greater power of the more careful study.

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