Terms and Synonyms Searched:
| Terms | Search Results* | Entire Database** |
|---|---|---|
| Synonyms | ||
| ionis | 68 studies | 153 studies |
| Double | 68 studies | 85,926 studies |
| doubled | -- | 349 studies |
| doubling | -- | 675 studies |
| Dual | -- | 6,656 studies |
| Duplicate | -- | 503 studies |
| duplicating | -- | 9 studies |
| Replicate | -- | 524 studies |
| replicated | -- | 250 studies |
| replicates | -- | 123 studies |
| replicating | -- | 151 studies |
| twinning | -- | 8 studies |
| ISI | 68 studies | 1,755 studies |
| Insomnia severity index | -- | 1,218 studies |
| Placebo | 68 studies | 77,374 studies |
| placebo-controlled | 67 studies | 31,829 studies |
| fake drug | -- | 2 studies |
| sham therapy | -- | 186 studies |
| sham treatment | -- | 636 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 |