| http://www.w3.org/ns/prov#value | - But why African-Americans are more likely to deliver babies early is a complicated question with no easy answer.Researchers are now homing in on chronic stress as a contributing factor to pre-term births.???This is so challenging because it???s a combination of so many factors that are all interrelated,??? said Yvonne Graham, an associate commissioner in the Office of Minority Health and Health Di
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