You don't even have to have a positive expectation to be subject to some kind of placebo effect.
One could be convinced the practitioner is a quack but the fact there's some human interaction and concern can have an impact (or a negative impact if the person is cold and uncaring). If you spent your hard earned money on it, or even if it is free but it was your idea to go, could also impact the results. All well known cognitive things which will change one's perceptions without them knowing about it.
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