title: Postcards encourage participant updates.
authors.forename: Kari E
authors.initials: KE
authors.lastname: Welch
authors.forename: Cynthia A
authors.initials: CA
authors.lastname: Leardmann
authors.forename: Isabel G
authors.initials: IG
authors.lastname: Jacobson
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Speigle
authors.forename: Besa
authors.initials: B
authors.lastname: Smith
authors.forename: Tyler C
authors.initials: TC
authors.lastname: Smith
authors.forename: Margaret A
authors.initials: MA
authors.lastname: Ryan
mesh_terms: D015331:Cohort Studies; D003256:Community Participation; D006801:Humans; D011177:Postal Service / Q000706:statistics & numerical data*; D014481:United States