The one cited in the link was controlled and blinded using sham stimulation in the group. The problem isn't that it wasn't controlled, it may not have been pow

The one cited in the link was controlled and blinded using sham stimulation in the group. The problem isn't that it wasn't controlled, it may not have been powered (n=30ish?) enough to reliably detect a difference...which is the main bugaboo in clinical science. Recruiting enough people into the study to make it meaningful is the hard and expensive part.