Terms and Synonyms Searched:
| Terms | Search Results* | Entire Database** |
|---|---|---|
| Synonyms | ||
| standard | 34,995 studies | 83,128 studies |
| United States | 34,994 studies | 166,188 studies |
| U.S. | 792 studies | 3,954 studies |
| U S | 1 studies | 10 studies |
| States | 34,856 studies | 188,461 studies |
| stated | 126 studies | 1,443 studies |
| Territory | 125 studies | 1,573 studies |
| United | 34,844 studies | 182,311 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 |