Twin Births in the U.S. Are Dropping, and Experts Have a Theory

Researchers believe that the decline may be connected to advances in embryo transfers during in vitro fertilization.
By BY CHRISTINE HAUSER from NYT Health https://ift.tt/2o5NRQo
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Birth Rates, Infertility, Pregnancy and Childbirth, In Vitro Fertilization
Source New York Times
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