Assertion: placebo's study | /r/HasProperty | dated to pioneering paper
Facets:
value: on "the powerful placebo"
type: LOCATION
value: usually
type: DEGREE
value: by the anesthesiologist
type: OTHER
Source sentences:
text: The scientific study of the placebo effect is usually dated to the pioneering paper published in 1955 on "The Powerful Placebo" by the anesthesiologist Henry K. Beecher (1904-1976).