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Document Type: Research Article
Affiliations: 1: Eugene Declercq is at the Maternal and Child Health Department, Boston University School of Public Health, Boston, Massachusetts 2: Marian MacDorman and Fay Menacker are at the Division of Vital Statistics, National Center for Health Statistics, Centers for Disease Control and Prevention, Hyattsville, Maryland 3: Michael Malloy is at the Department of Pediatrics, University of Texas Medical Branch, Galveston, Texas, USA.
Publication date: September 1, 2006