Citation: Am. Vanhuesden et al., A COMPARATIVE CLINICAL INVESTIGATION OF ENDOCRINE PARAMETERS WITH 2 LOW-DOSE ORAL-CONTRACEPTIVES CONTAINING EITHER 75 MU-G GESTODENE OR 150MU-G DESOGESTREL COMBINED WITH 20 MU-G ETHINYLESTRADIOL, Gynecological endocrinology, 12, 1998, pp. 13-19