Editorial: Perinatology begins before conception.
D000022:Abortion, Spontaneous / Q000209:etiology*; D002869:Chromosome Aberrations; D025063:Chromosome Disorders; D003075:Coitus; D005260:Female; D005306:Fertilization; D006801:Humans; D008297:Male; D010060:Ovulation; D010063:Ovum / Q000502:physiology*; D011247:Pregnancy; D011336:Probability; D013094:Spermatozoa / Q000502:physiology*; D013997:Time Factors