{Reference Type}: Comparative Study
{Title}: Comparative efficacy of combined oral contraceptives and the levonorgestrel 52 mg IUD.
{Author}: Creinin MD;Brown JA;Rankin HA;Yazdani S;
{Journal}: Eur J Obstet Gynecol Reprod Biol
{Volume}: 300
{Issue}: 0
{Year}: 2024 Sep 22
{Factor}: 2.831
{DOI}: 10.1016/j.ejogrb.2024.07.044
{Abstract}: The relative risk of pregnancy with the levonorgestrel 52 mg IUD is 3 times lower than with optimal combined oral contraceptive use.