| #1 | TI=(antibiotic) |
| #2 | TI=(antimicrob*) |
| #3 | TI=(anti infecti*) |
| #4 | TI=(antiinfecti*) |
| #5 | #1 OR #2 OR #3 OR #4 |
| #6 | TI=(prophyla*) |
| #7 | TI=(prevent*) |
| #8 | #6 OR #7 |
| #9 | #8 AND #5 |
| #10 | TI=(clean) |
| #11 | TI=(surgery) |
| #12 | TI=(tech*) |
| #13 | TI=(proced*) |
| #14 | #13 OR #12 OR #11 |
| #15 | #14 AND #10 |
| #16 | TI=(herni*) |
| #17 | TI=(wound infection) |
| #18 | #17 AND #15 |
| #19 | #18 OR #16 OR #15 |
| #20 | #19 AND #9 |
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