Assertion: placebo's study | /r/HasProperty | 4 expert opinion
Facets:
Source sentences:
text: * Non-randomised intervention studies (controlled non-randomised trial, controlled before-and-after, interrupted time series), comparative cohort and correlation studies with a low risk of confounding, bias or chance 3 Non-Analytical studies (e.g., case reports, case series) 4 Expert opinion, formal consensus