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• Authors

  • Grimes, David A
  • Helmerhorst, Frans M
  • Schulz, Kenneth F
  • Van Vliet, Hubertus A A M
  • van Vliet, Hubertus A A M

• Topics

  • Contraception
  • Contraceptives, Oral
  • Contraceptives, Oral, Combined
  • Contraceptives, Oral, Synthetic
  • Drug Combinations
  • Estradiol Congeners
  • Ethinyl Estradiol
  • Ethinyl Estradiol-Norgestrel Combination
  • Female
  • Humans
  • Levonorgestrel
  • Menstrual Cycle
  • Norethindrone
  • Pregnancy
  • Pregnancy Rate
  • Progesterone Congeners
  • Randomized Controlled Trials as Topic
  • adverse effects
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  • English