MEDLINE: inception to December 19, 2019
| Step | Search Criteria | Citations |
|---|---|---|
| 1. | ketamine.mp. or exp Ketamine/ | 20289 |
| 2. | depression.mp. or exp Depression/ | 407001 |
| 3. | 1 and 2 | 2444 |
| 4. | limit 3 to humans | 1126 |
| 5. | limit 4 to randomized controlled trial | 189 |
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