title: A proposal for topic-based impact factors and their application to occupational health literature.
authors.affiliation: Department of Environmental Epidemiology, Institute of Industrial Ecological Sciences, University of Occupational and Environmental Health, Kitakyushu City 807-8555, Japan.
authors.forename: Masamichi
authors.initials: M
authors.lastname: Uehara
authors.forename: Ken
authors.initials: K
authors.lastname: Takahashi
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Hoshuyama
authors.forename: Chieko
authors.initials: C
authors.lastname: Tanaka
mesh_terms: D015706:Bibliometrics; D006801:Humans; D016239:MEDLINE; D016272:Occupational Health; D010506:Periodicals as Topic