TY  - GEN
AU  - Huntington,K M
TI  - Letter: Progestagen-only contraception and tubal pregnancies
SN  - 0140-6736
PY  - 1974///0429
KW  - Female
KW  - Humans
KW  - Norethindrone
KW  - adverse effects
KW  - Pregnancy
KW  - Pregnancy, Ectopic
KW  - epidemiology
N1  - Publication Type: Journal Article
UR  - https://doi.org/10.1016/s0140-6736(74)93119-5
ER  -