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- Constant multiplier
- After the widespread introduction of hormonal fertility treatments in the 1960s, the rate of multiple births—twins, triplets, quadruplets, etc.—in humans was in comparative flux. Since the mid-1970s, however, twinning rates have steadily increased.Fertility treatments affect only the occurrence of fraternal twins. Fraternal twins (or triplets, quadruplets, etc.) are the result...
- Tags: birth, Guest Contributor, multiple birth, quadruplet
- Technical articles 2003-12-16
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