| journal article | The predominant publication type for articles and other items indexed for nlm databases. (12 Dec 1998) |
|---|---|
| contraception | The prevention of conception or impregnation. (18 Nov 1997) |
| contraception behaviour | Behaviour patterns of those practicing contraception. (12 Dec 1998) |
| contraception, immunologic | Contraceptive methods utilizing immunologic processes. (12 Dec 1998) |