Twinning Rates in Developed Countries: Trends and Explanations
The twinning rate has increased dramatically over the last four decades in developed countries. Two main factors account for this increase: delayed childbearing, as older women tend to have twins more frequently than younger ones, and the expansion of medically assisted reproduction (MAR), which car...
| Autors principals: | , , |
|---|---|
| Format: | Journal article |
| Publicat: |
Wiley
2015
|