Letter: Selecting the sex of one's children.
D000028:Abortion, Induced; D000649:Amniocentesis; D001290:Attitude; D002648:Child; D005191:Family Characteristics; D005193:Family Planning Services; D005260:Female; D006801:Humans; D008297:Male; D011247:Pregnancy; D012732:Sex Determination Analysis; D012737:Sex Factors; D012744:Sex Ratio