TY - JOUR TI - Factors associated with nonadherence to instructions for using the Nestorone®/ethinyl estradiol contraceptive vaginal ring PY - 2018 AU - Stifani, Bianca M. AU - Plagianos, Marlena AU - Vieira, Carolina Sales AU - Merkatz, Ruth B. T2 - Contraception SN - 0010-7824 DO - 10.1016/j.contraception.2017.12.011 UR - https://doi.org/10.1016/j.contraception.2017.12.011 PP - New York VL - 97 IS - 5 SP - 415-421 ER -