The article talks about their medication history. Do you have a source to back up your claim here? I've only seen it as a requirement to have been on antidepressants unsuccessfully.

Here's a longer article on point:

>"typically, unipolar depression that do not respond effectively after two trials of antidepressant monotherapy in adequate dosage and durations (at least 8 weeks, may be 12 weeks in some cases) and often do not respond satisfactorily to numerous sequential treatment regimens” [7].

Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4609854/

This is consistent with what I've heard from practitioners. And it is a strict requirement. There are some fairly desperate people that come to their office asking if there's a way around it. I've never heard them say that they could private pay. But I would be open to seeing an alternative source.

In any event, practically everybody in this experiment will have been on antidepressants. Even if it is only because of an insurance requirement.