title: Decline in the United States black preterm/low birth weight rate in the 1990s: can the economic boom explain it?
authors.affiliation: Office of Epidemiology, Policy and Evaluation, Maternal and Child Health Bureau, Health Resources and Services Administration, Rockville, MD 20852, USA. ASchempf@hrsa.gov
authors.forename: Ashley H
authors.initials: AH
authors.lastname: Schempf
authors.forename: Sandra L
authors.initials: SL
authors.lastname: Decker