title: Is there a continuing role for prospective observational studies in spine research?
authors.forename: Robert B
authors.initials: RB
authors.lastname: Keller
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Atlas
mesh_terms: D035843:Biomedical Research; D015331:Cohort Studies; D006801:Humans; D011446:Prospective Studies; D012107:Research Design; D013122:Spinal Diseases