title: Keeping participants enrolled: use of gradient.
authors.affiliation: Kowalski and Associates, Larkspur, Colorado, USA.
authors.forename: Karren
authors.initials: K
authors.lastname: Kowalski
mesh_terms: D004509:Education, Nursing, Continuing; D006801:Humans; D013663:Teaching / Q000379:methods*; D014481:United States