title: Sampling.
authors.affiliation: Nursing Research Department, James A. Haley Veterans Hospital, Tampa, Florida, USA.
authors.forename: B
authors.initials: B
authors.lastname: Simmons
authors.forename: B
authors.initials: B
authors.lastname: Kelly
authors.forename: S L
authors.initials: SL
authors.lastname: Luther
mesh_terms: D016000:Cluster Analysis; D003627:Data Interpretation, Statistical; D006801:Humans; D011897:Random Allocation; D012494:Sampling Studies