Article PubMed
Contraception  (1999)

Preregistration study on the safety and contraceptive efficacy of a progesterone-releasing vaginal ring in Chilean nursing women.

Massai, R; Miranda, P; Valdés, P; Lavín, P; Zepeda, A; Casado, M E; Silva, M A; Fetis, G; Bravo, C; Chandía, O; Peralta, O; Croxatto, H B; Díaz, S