Randomized comparison of bleeding patterns in women using a combined contraceptive vaginal ring or a low-dose combined oral contraceptive on a menstrually signaled regimen.
Reference
Weisberg E, Merki-Feld GS, McGeechan K, Fraser IS., 2014,
Randomized comparison of bleeding patterns in women using a combined contraceptive vaginal ring or a low-dose combined oral contraceptive on a menstrually signaled regimen., Contraception, 2015; 91(2) 121-6
