COVID-19 is an emerging, rapidly evolving situation.
Get the latest public health information from CDC:

Get the latest research information from NIH: Menu
Open or close the search fields display
346 Studies found for: subjects AND Double-blind AND Petersburg | ( Map: Mexico )

Terms and Synonyms Searched:

Terms Search Results* Entire Database**
subjects 346 studies 92,060 studies
Study Participant 11 studies 4,325 studies
Double-blind 346 studies 37,989 studies
double-blinded 7 studies 4,157 studies
Double Masked Study 1 studies 57 studies
double mask -- 6 studies
Double Masked Method -- 1 studies
Petersburg 346 studies 5,110 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