Anticoncepcionais Femininos/farmacologia; Gravidez; Progesterona/sangue; Animais; Feminino; Cobaias; Humanos; Menstruação; Naftalenos/farmacologia; Norandrostanos/farmacologia; Ovulação/efeitos dos fármacos

Asia; Biology; China; Clinical Research; Contraception; Contraceptive Agents; Contraceptive Agents, Female; Contraceptive Agents, Postcoital; Cultural Background; Demographic Factors; Developing Countries; Eastern Asia; Endocrine System; Ethnic Groups; Examinations And Diagnoses; Family Planning; Hormones; Laboratory Examinations And Diagnoses; Laboratory Procedures; Menstrual Cycle; Menstruation; Physiology; Population; Population Characteristics; Pregnancy; Progestational Hormones; Progesterone--analysis; Reproduction; Research Methodology