Seasonal cycles of human conception.
D000531:Altitude; D002170:Canada; D002980:Climate; D003270:Contraceptive Agents; D003273:Contraceptive Devices; D005260:Female; D005306:Fertilization; D006728:Hormones / Q000502:physiology; D006801:Humans; D007086:Illegitimacy; D007194:India; D008297:Male; D008393:Marriage; D010060:Ovulation; D010507:Periodicity; D011247:Pregnancy; D044469:Racial Groups; D012621:Seasons; D013696:Temperature; D006113:United Kingdom; D014481:United States
D003270:Contraceptive Agents; D006728:Hormones