Challenges to the development of new contraceptive technology in the 21st century.
Xiao
B
B
National Research Institute for Family Planning, Beijing 100081, China.
D003271:Contraceptive Agents, Female; D003272:Contraceptive Agents, Male; D003278:Contraceptives, Oral, Hormonal; D004365:Drugs, Chinese Herbal; D005193:Family Planning Services / Q000639:trends; D005260:Female; D006801:Humans; D007434:Intrauterine Devices; D008297:Male
D003271:Contraceptive Agents, Female; D003272:Contraceptive Agents, Male; D003278:Contraceptives, Oral, Hormonal; D004365:Drugs, Chinese Herbal