Not necessary apparently, https://www.health.harvard.edu/blog/placebo-can-work-even-know-placebo-201607079926 https://www.health.harvard.edu/blog/placebo-can-wo

Not necessary apparently, https://www.health.harvard.edu/blog/placebo-can-work-even-know-placebo-201607079926 https://www.health.harvard.edu/blog/placebo-can-work-even-kn...