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 Custom Filters

Publication date

Text availability

Article attribute

Article type

Additional filters

Article Language

Species

Sex

Age

Other

Search Results

31 results

Filters applied: . Clear all
Results are displayed in a computed author sort order. The Publication Date timeline is not available.
Page 1
A multicenter study of levonorgestrel-estradiol contraceptive vaginal rings. I-Use effectiveness. An international comparative trial.
Sivin I, Mishell DR Jr, Victor A, Diaz S, Alvarez-Sanchez F, Nielsen NC, Akinla O, Pyorala T, Coutinho E, Faundes A, Roy S, Brenner PF, Ahren T, Pavez M, Brache V, Giwa-Osagie OF, Fasan MO, Zausner-Guelman B, Darze E, Gama daSilva JC, Diaz J, Jackanicz TM, Stern J, Nash HA. Sivin I, et al. Among authors: jackanicz tm. Contraception. 1981 Oct;24(4):341-58. doi: 10.1016/0010-7824(81)90003-2. Contraception. 1981. PMID: 6459208
A multicenter study of levonorgestrel-estradiol contraceptive vaginal rings. II-Subjective and objective measures of effects. An international comparative trial.
Sivin I, Mishell DR Jr, Victor A, Diaz S, Alvarez-Sanchez F, Nielsen NC, Akinla O, Pyorala T, Coutinho E, Faundes A, Roy S, Brenner PF, Ahren T, Pavez M, Brache V, Giwa-Osagie OF, Fasan MO, Zausner-Guelman B, Darze E, Gama daSilva JC, Diaz J, Jackanicz TM, Stern J, Nash HA. Sivin I, et al. Among authors: jackanicz tm. Contraception. 1981 Oct;24(4):359-76. doi: 10.1016/0010-7824(81)90004-4. Contraception. 1981. PMID: 6797782 Clinical Trial.
A multicenter study of levonorgestrel-estradiol contraceptive vaginal rings. III-Menstrual patterns. An international comparative trial.
Sivin I, Mishell DR Jr, Victor A, Diaz S, Alvarez-Sanchez F, Nielsen NC, Akinla O, Pyorala T, Coutinho E, Faundes A, Roy S, Brenner PF, Ahren T, Pavez M, Brache V, Giwa-Osagie OF, Fasan MO, Zausner-Guelman B, Darze E, Gama daSilva JC, Diaz J, Jackanicz TM, Stern J, Nash HA. Sivin I, et al. Among authors: jackanicz tm. Contraception. 1981 Oct;24(4):377-92. doi: 10.1016/0010-7824(81)90005-6. Contraception. 1981. PMID: 6797783
31 results