TY  - RPRT
TI  - Cervical smears--when and how often?
AU  - A I Spriggs
AU  - O A Husain
PY  - 1977
DO  - 10.1016/s0140-6736(77)91003-0
UR  - https://pubmed.ncbi.nlm.nih.gov/69924/
ID  - 69924
ER  -