title: Biological markers: broadening or narrowing the scope of epidemiology.
authors.affiliation: Centre for Epidemiological Research in Southern Africa, SA Medical Research Council, Tygerberg.
authors.forename: D
authors.initials: D
authors.lastname: Yach
mesh_terms: D015415:Biomarkers; D004813:Epidemiology; D006801:Humans
chemical_list: D015415:Biomarkers