To learn how to update the categories for this article, see here. To update categories, edit the metadata template.
Definition: Use of some parts of a treatment that do have physical effects on a subject, which are intended to act as placebo where it is impossible to have a completely neutral equivalent to the treatment. While a pill with no active ingredients can be a placebo, for surgery, sham surgery would require at least anesthesia and an incision. [d] [e]
