title: Evolution of Communities in the Medical Sciences: Evidence from the Medical Words Network.
abstract: BACKGROUND
  Classification of medical sciences into its sub-branches is crucial for optimum administration of healthcare and specialty training. Due to the rapid and continuous evolution of medical sciences, development of unbiased tools for monitoring the evolution of medical disciplines is required.
  
  
  RESULTS
  Network analysis was used to explore how the medical sciences have evolved between 1980 and 2015 based on the shared words contained in more than 9 million PubMed abstracts. The k-clique percolation method was used to extract local research communities within the network. Analysis of the shared vocabulary in research papers reflects the trends of collaboration and splintering among different disciplines in medicine. Our model identifies distinct communities within each discipline that preferentially collaborate with other communities within other domains of specialty, and overturns some common perceptions.
  
  
  CONCLUSIONS
  Our analysis provides a tool to assess growth, merging, splitting and contraction of research communities and can thereby serve as a guide to inform policymakers about funding and training in healthcare.
authors.affiliation: Department of Physics, Shahid Beheshti University - G.C., Tehran, Iran.
authors.forename: Amir H
authors.initials: AH
authors.lastname: Shirazi
authors.affiliation: Department of Physics, Shahid Beheshti University - G.C., Tehran, Iran.
authors.forename: Arash
authors.initials: A
authors.lastname: Badie Modiri
authors.affiliation: Department of Physics, Shahid Beheshti University - G.C., Tehran, Iran.
authors.forename: Sara
authors.initials: S
authors.lastname: Heydari
authors.affiliation: Centre for Nephrology, UCL Division of Medicine, Royal Free Campus, University College London, London, United Kingdom.
authors.forename: Jennifer L
authors.identifier: http://orcid.org/0000-0001-8766-6056
authors.initials: JL
authors.lastname: Rohn
authors.affiliation: Department of Physics, Shahid Beheshti University - G.C., Tehran, Iran.
authors.forename: Gholam R
authors.initials: GR
authors.lastname: Jafari
authors.affiliation: Institute for Liver and Digestive Health, UCL Division of Medicine, Royal Free Campus, University College London, London, United Kingdom.
authors.forename: Ali R
authors.initials: AR
authors.lastname: Mani
mesh_terms: D035843:Biomedical Research; D006801:Humans; D018875:Vocabulary, Controlled