Sample search strategy from MEDLINE
| 1 | *adolescent/ |
| 2 | teen*.ti,ab. |
| 3 | adolescen*.ti,ab. |
| 4 | underage.ti,ab. |
| 5 | youth*.ti,ab. |
| 6 | (Young adj2 (person or people or adult*)).ti,ab. |
| 7 | (School adj2 (child* or student* or age)).ti,ab. |
| 8 | minor*.ti,ab. |
| 9 | student*.ti,ab. |
| 10 | (under adj2 (eighteen or ‘18’)).ti,ab. |
| 11 | (under adj2 (twenty five or ‘25’)).ti,ab. |
| 12 | 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10 or 11 |
| 13 | *contraception/ |
| 14 | *family planning services/ |
| 15 | *birth control/ |
| 16 | *contraceptive behavior/ |
| 17 | (family adj2 planning).ti,ab. |
| 18 | (birth adj2 control).ti,ab. |
| 19 | sexual health service*.ti,ab. |
| 20 | sexual health clinic*.ti,ab. |
| 21 | (Contracepti* and (pharmacy or pharmacist* or community or service* or access* or provision or support* or clinic* or availab* or emergency or delivery or outreach or advice or information or intention*)).ti,ab. |
| 22 | 13 or 14 or 15 or 16 or 17 or 18 or 19 or 20 or 21 |
| 23 | exp Pregnancy, Unwanted/ |
| 24 | exp Pregnancy, Unplanned/ |
| 25 | (Pregnan* adj2 (unwanted or unplanned or unintent* or accident*)).ti,ab. |
| 26 | conception*.ti,ab. |
| 27 | (Prevent* adj2 pregnancy).ti,ab. |
| 28 | 23 or 24 or 25 or 26 or 27 |
| 29 | 22 or 28 |
| 30 | 12 and 29 |
| 31 | limit 30 to (humans and yr=‘1995-2008’) |