None listed
Conditions
Interventions
Sponsors
Study design
Eligibility
Inclusion criteria
Women 18-40 years, good physical and mental health, having regular menstrual cycles with a usual length between 24 and 35 days and a body mass index between 18 and 35 kg/m2. Subjects who are not willing to give written consent will not be allowed to enter.
Exclusion criteria
Contraindications for contraceptives, hypertension, history during pregnancy or during previous use of of sex steroids of a.o. jaundice, gallstone formation, porphyria, hemolytic uremic syndrome, use of drugs that may interfere with the pharmacokinetics of sex steroids.