Editorial: On rhythm and sex ratio.
D001831:Body Temperature; D003075:Coitus; D004777:Environment; D005193:Family Planning Services; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007314:Insemination; D008297:Male; D010060:Ovulation; D011247:Pregnancy; D011336:Probability; D012730:Sex Chromosomes; D012744:Sex Ratio; D013094:Spermatozoa; D013995:Time; D013997:Time Factors; D014481:United States