title: Recruitment of older adults: an ongoing challenge.
authors.affiliation: The University of Iowa College of Nursing, Iowa City, USA.
authors.forename: Kathleen C
authors.initials: KC
authors.lastname: Buckwalter
mesh_terms: D000368:Aged; D002986:Clinical Trials as Topic; D005851:Geriatric Nursing / Q000458:organization & administration; D006801:Humans; D015399:Nursing Research / Q000458:organization & administration*; D018579:Patient Selection; D035842:Research Subjects / Q000600:supply & distribution*; D018401:Sample Size