title: Maintaining informed consent validity during lengthy research protocols.
authors.affiliation: University of Maryland School of Medicine, USA.
authors.forename: Kristen J
authors.initials: KJ
authors.lastname: Prentice
authors.forename: Paul S
authors.initials: PS
authors.lastname: Appelbaum
authors.forename: Robert R
authors.initials: RR
authors.lastname: Conley
authors.forename: William T
authors.initials: WT
authors.lastname: Carpenter
mesh_terms: D000328:Adult; D035843:Biomedical Research / Q000458:organization & administration* / Q000592:standards; D002985:Clinical Protocols / Q000592:standards*; D028744:Ethics Committees, Research; D005260:Female; D006801:Humans; D007258:Informed Consent / Q000592:standards*; D008297:Male; D015203:Reproducibility of Results; D013997:Time Factors; D014481:United States