Article · Journal · 1981

A multicenter study of levonorgestrel—Estradiol contraceptive vaginal rings I — Use effectiveness

Irving Sivin, Daniel R. Mishell, Arne Victor, Soledad Diaz, Francisco Alvarez-Sanchez, Niels C. Nielsen and 18 more

Contraception

• Closed access
• World top 10%
• International · 6 countries

Go to the publisher10.1016/0010-7824(81)90003-2