| Search Number | Search Terms/Strategy |
|---|---|
| #18 | Search #17 AND #14 Limits: Publication Date from 1999 to 2002, English, Human |
| #17 | Search #16 AND #15 Limits: Publication Date from 1999 to 2002, English, Human |
| #16 | Search randomized or controlled or clinical Limits: Publication Date from 1999 to 2002, English, Human |
| #15 | Search trial Limits: Publication Date from 1999 to 2002, English, Human |
| #14 | Search #8 AND #9 Field: All Fields, Limits: Publication Date from 1999 to 2002, English, Human |
| #13 | Search #8 AND #9 Field: All Fields, Limits: Publication Date from 1999 to 2002, English, Randomized Controlled Trial, Human |
| #12 | Search #8 AND #9 Field: All Fields, Limits: English, Randomized Controlled Trial, Human |
| #11 | Search #8 AND #9 Field: All Fields, Limits: English, Human |
| #10 | Search #8 AND #9 |
| #9 | Search #6 OR #7 |
| #8 | Search #4 OR #5 |
| #7 | Search "precancerous conditions"[MESH] |
| #6 | Search "neoplasms"[MESH] |
| #5 | Search "antioxidants"[MESH] |
| #4 | Search ("Vitamins/administration and dosage"[MESH] OR "Vitamins/therapeutic use"[MESH]) |