TY  - RPRT
TI  - Low-dose progestogens and ectopic pregnancy.
AU  - P Liukko
AU  - R Erkkola
PY  - 1976
DO  - 10.1136/bmj.2.6046.1257-a
UR  - https://pubmed.ncbi.nlm.nih.gov/990873/
ID  - 990873
ER  -