Ethnic density and preterm birth in African-, Caribbean-, and US-born non-Hispanic black populations in New York City.
Mason SM, Kaufman JS, Emch ME, Hogan VK, Savitz DA. Ethnic density and preterm birth in African-, Caribbean-, and US-born non-Hispanic black populations in New York City. Am J Epidemiol. 2010 Oct 01; 172(7):800-8.