Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation

Search Page

Filters

My NCBI Filters

Text availability

Article attribute

Article type

Publication date

Search Results

1,637 results

Filters applied: . Clear all
Results are displayed in a computed author sort order. The Results By Year timeline is not available.
Page 1
Levonorgestrel concentrations during use of levonorgestrel rod (LNG ROD) implants.
Sivin I, Lähteenmäki P, Ranta S, Darney P, Klaisle C, Wan L, Mishell DR Jr, Lacarra M, Viegas OA, Bilhareus P, Koetsawang S, Piya-Anant M, Diaz S, Pavez M, Alvarez F, Brache V, LaGuardia K, Nash H, Stern J. Sivin I, et al. Among authors: alvarez f. Contraception. 1997 Feb;55(2):81-5. doi: 10.1016/s0010-7824(96)00276-4. Contraception. 1997. PMID: 9071516 Free article. Clinical Trial.
Contraceptives for lactating women: a comparative trial of a progesterone-releasing vaginal ring and the copper T 380A IUD.
Sivin I, Díaz S, Croxatto HB, Miranda P, Shaaban M, Sayed EH, Xiao B, Wu SC, Du M, Alvarez F, Brache V, Basnayake S, McCarthy T, Lacarra M, Mishell DR Jr, Koetsawang S, Stern J, Jackanicz T. Sivin I, et al. Among authors: alvarez f. Contraception. 1997 Apr;55(4):225-32. doi: 10.1016/s0010-7824(97)00008-5. Contraception. 1997. PMID: 9179454 Clinical Trial.
1,637 results