title: Five Authors Reply.
authors.affiliation: Epidemiology Branch, Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Rockville, MD.
authors.forename: Katherine L
authors.initials: KL
authors.lastname: Grantz
authors.affiliation: Epidemiology Branch, Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Rockville, MD.
authors.forename: Stefanie N
authors.initials: SN
authors.lastname: Hinkle
authors.affiliation: Epidemiology Branch, Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Rockville, MD.
authors.forename: Pauline
authors.initials: P
authors.lastname: Mendola
authors.affiliation: Epidemiology Branch, Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Rockville, MD.
authors.forename: Lindsey A
authors.initials: LA
authors.lastname: Sjaarda
authors.affiliation: Biostatistics and Bioinformatics Branch, Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Rockville, MD.
authors.forename: Paul S
authors.initials: PS
authors.lastname: Albert
mesh_terms: D000026:Abortion, Habitual / Q000453:epidemiology*; D005260:Female; D006801:Humans; D011247:Pregnancy; D047928:Premature Birth / Q000453:epidemiology*