This is a study on a new low dose levonorgestrel contraceptive intrauterine systems (LCS). The purpose of the study is to investigate which of the 2 administered doses is the effective intrauterine dose of Levonorgestrel (LNG) administered via the LCS for contraception during 3 years.
I think its interesting that they are working on a 3yr IUD considering the amount of people having issues with the 5 yr.