TY  - RPRT
TI  - IUD compared with oral contraception in nulliparae.
AU  - A Bergqvist
AU  - G Rybo
PY  - 1979
DO  - 10.1016/s0010-7824(79)80050-5
UR  - https://pubmed.ncbi.nlm.nih.gov/509964/
ID  - 509964
ER  -