TY  - RPRT
TI  - Risk factors for ectopic pregnancy. A population-based study.
AU  - P A Marchbanks
AU  - J F Annegers
AU  - C B Coulam
AU  - J H Strathy
AU  - L T Kurland
PY  - 1988
UR  - https://pubmed.ncbi.nlm.nih.gov/3343790/
ID  - 3343790
ER  -