title: Commentary.
authors.forename: John T
authors.initials: JT
authors.lastname: O'Brien
mesh_terms: D000544:Alzheimer Disease / Q000150:complications / Q000175:diagnosis; D019411:Clinical Laboratory Techniques / Q000379:methods / Q000639:trends; D003072:Cognition Disorders / Q000175:diagnosis / Q000209:etiology; D034462:Dissent and Disputes; D006801:Humans; D015203:Reproducibility of Results; D012106:Research / Q000639:trends