Terms and Synonyms Searched:
| Terms | Search Results* | Entire Database** |
|---|---|---|
| Synonyms | ||
| standard | 32,207 studies | 75,082 studies |
| United States | 32,206 studies | 155,942 studies |
| U.S. | 728 studies | 3,753 studies |
| U S | 1 studies | 9 studies |
| States | 32,074 studies | 175,152 studies |
| stated | 111 studies | 1,221 studies |
| Territory | 109 studies | 1,374 studies |
| United | 32,065 studies | 170,860 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 |