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10804 Studies found for: Placebo AND once

Terms and Synonyms Searched:

Terms Search Results* Entire Database**
Synonyms
Placebo 10,804 studies 58,783 studies
placebo-controlled 5,483 studies 24,220 studies
sham treatment 39 studies 410 studies
sham therapy 24 studies 192 studies
fake drug -- 1 studies
once 10,804 studies 33,082 studies
Single event 4 studies 24 studies

   
-- No studies found
* Number of studies in the search results containing the term or synonym
** Number of studies in the entire database containing the term or synonym