Task Force on Oral Contraceptives, Suporn Koetsawang, A. V. Mandlekar, Usha R. Krishna, V. N. Purandare, C. K. Deshpande, S. C. Chew, Rosilind Fong, S. S. Ratnam, L. Kovacs, S. Zalanyi, A. Tekulics, M. Briggs, M. A. Belsey, P. E. Hall, R. A. Parker A randomized, double-blind study of two combined oral contraceptives containing the same progestogen, but different estrogens. Contraception. Vol.21, No.5 (1980), 445-459. doi:10.1016/0010-7824(80)90010-4 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/11184
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A randomized, double-blind study of two combined oral contraceptives containing the same progestogen, but different estrogens