title: Unexpected mailed survey response rates.
authors.forename: Lee Ann
authors.initials: LA
authors.lastname: Riesenberg
authors.forename: Paula
authors.initials: P
authors.lastname: Rosenbaum
authors.forename: Sheldon L
authors.initials: SL
authors.lastname: Stick
mesh_terms: D003625:Data Collection / Q000191:economics* / Q000379:methods; D004503:Education, Medical, Graduate; D006801:Humans; D009042:Motivation; D011177:Postal Service; D014040:Token Economy; D014481:United States