title: Global problems require global studies.
authors.forename: Adrian E
authors.initials: AE
authors.lastname: Bauman
authors.forename: James F
authors.initials: JF
authors.lastname: Sallis
mesh_terms: D015444:Exercise; D014943:Global Health; D006801:Humans; D011159:Population Surveillance / Q000379:methods*; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D014944:World Health Organization