TY  - RPRT
TI  - A three-year clinical trial with levonorgestrel silastic implants.
AU  - S Diaz
AU  - M Pavez
AU  - D N Robertson
AU  - H B Croxatto
PY  - 1979
DO  - 10.1016/0010-7824(79)90004-0
UR  - https://pubmed.ncbi.nlm.nih.gov/385243/
ID  - 385243
ER  -