The search strategy in PubMed
| Number | Search terms |
| #1 | Ropivacaine (Mesh) |
| #2 | Ropivacaine (title/abstract) |
| #3 | #1 OR #2 |
| #4 | Nerve block (title/abstract) |
| #5 | Nerve blockade (title/abstract) |
| #6 | Peripheral nerve block (title/abstract) |
| #7 | Peripheral nerve blockade (title/abstract) |
| #8 | #4 OR #5 OR #6 OR #7 |
| #9 | Randomised controlled trial (title/abstract) |
| #10 | Randomised (title/abstract) |
| #11 | Clinical study (title/abstract) |
| #12 | Clinical trial (title/abstract) |
| #13 | Controlled clinical trial (Title/Abstract) |
| #14 | #9 OR #10 OR #11 OR #12 OR #13 |
| #15 | #3 AND #8 AND #14 |