title: Recruiting and retaining hard-to-reach populations: lessons learned and targeted strategies from arthritis physical activity intervention studies.
authors.forename: Mary
authors.initials: M
authors.lastname: Altpeter
authors.forename: Laura O
authors.initials: LO
authors.lastname: Houenou
authors.forename: Kathryn R
authors.initials: KR
authors.lastname: Martin
authors.forename: Britta
authors.initials: B
authors.lastname: Schoster
authors.forename: Leigh F
authors.initials: LF
authors.lastname: Callahan
mesh_terms: D001168:Arthritis / Q000628:therapy*; D002986:Clinical Trials as Topic; D005081:Exercise Therapy; D006801:Humans; D018579:Patient Selection