Terms and Synonyms Searched:
| Terms | Search Results* | Entire Database** |
|---|---|---|
| Synonyms | ||
| standard | 565 studies | 75,254 studies |
| United States | 565 studies | 156,177 studies |
| U.S. | 9 studies | 3,763 studies |
| U S | -- | 9 studies |
| States | 562 studies | 175,444 studies |
| Territory | 37 studies | 1,379 studies |
| stated | -- | 1,223 studies |
| United | 562 studies | 171,122 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 |