TY  - RPRT
TI  - Loop vs. shield: a competing risks analysis of IUD termination.
AU  - J Herson
AU  - C L Crocker
AU  - E Butts
PY  - 1976
DO  - 10.1016/s0010-7824(76)80009-1
UR  - https://pubmed.ncbi.nlm.nih.gov/975812/
ID  - 975812
ER  -