Casper, R F Evaluation and therapy of breakthrough bleeding in women using a triphasic oral contraceptive. [electronic resource] - Fertility and sterility Feb 1991 - 292-6 p. digital Publication Type: Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't ISSN: 0015-0282 Subjects--Topical Terms: AdolescentAdultContraceptives, Oral, Hormonal--adverse effectsContraceptives, Oral, Sequential--adverse effectsFemaleHemorrhage--etiologyHumans