TY  - RPRT
TI  - Correcting contraceptive failure rates for sample composition and sample section bias.
AU  - J Trussell
AU  - D Bloom
AU  - A Pebley
DO  - 10.1080/19485565.1981.9988465
UR  - https://pubmed.ncbi.nlm.nih.gov/7349703/
ID  - 7349703
ER  -