title: Electronic devices and applications to track physical activity.
authors.affiliation: Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.
authors.forename: Jennifer
authors.initials: J
authors.lastname: Schrack
authors.affiliation: Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.
authors.forename: Vadim
authors.initials: V
authors.lastname: Zipunnikov
authors.affiliation: Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.
authors.forename: Ciprian
authors.initials: C
authors.lastname: Crainiceanu
mesh_terms: D056044:Actigraphy / Q000295:instrumentation*; D040421:Cell Phone; D006801:Humans; D063731:Mobile Applications; D009043:Motor Activity; D016138:Walking