Assertion: placebo's study | /r/CapableOf | involve placebo
Facets:
value: from around the world
type: LOCATION
Source sentences:
text: You can find out in advance if a study you are considering might involve a placebo.
text: Although most studies involving placebos try to make sure participants are kept "blinded," meaning they don't know if they're taking a placebo or an active drug, the new study was different.
text: Moerman documents many studies involving placebos from around the world.