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2. Combined oral contraceptives;Briggs,1977
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4. Pituitary and ovarian function in women receiving hormonal contraception;Cohen;Contraception,1979
5. Relationship between serum levels of prolactin, estrogens, LH, FSH and progesterone during the menstrual cycle and treatment with steroids. Acta endocr. /Kbh./ 1973;Delvoye;Suppl.,1968