Terms and Synonyms Searched:
| Terms | Search Results* | Entire Database** |
|---|---|---|
| Synonyms | ||
| standard | 10 studies | 75,981 studies |
| United States | 10 studies | 157,137 studies |
| U.S. | 1 studies | 3,772 studies |
| U S | -- | 9 studies |
| States | 9 studies | 176,695 studies |
| stated | -- | 1,251 studies |
| Territory | -- | 1,394 studies |
| United | 9 studies | 172,193 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 |