JAIN, M. G.; MAZUMDAR, M.; JAIN, N. K. A study to compare the efficacy, acceptability and side effect of combined contraceptive vaginal ring with the combined oral contraceptive pills in a tertiary health centre located in central India. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, [S. l.], v. 9, n. 8, p. 3208–3214, 2020. DOI: 10.18203/2320-1770.ijrcog20203297. Disponível em: https://www.ijrcog.org/index.php/ijrcog/article/view/8584. Acesso em: 3 dec. 2025.