title: Scientometric trends and knowledge maps of global health systems research.
abstract: BACKGROUND
  In the last few decades, health systems research (HSR) has garnered much attention with a rapid increase in the related literature. This study aims to review and evaluate the global progress in HSR and assess the current quantitative trends.
  
  
  METHODS
  Based on data from the Web of Science database, scientometric methods and knowledge visualization techniques were applied to evaluate global scientific production and develop trends of HSR from 1900 to 2012.
  
  
  RESULTS
  HSR has increased rapidly over the past 20 years. Currently, there are 28,787 research articles published in 3,674 journals that are listed in 140 Web of Science subject categories. The research in this field has mainly focused on public, environmental and occupational health (6,178, 21.46%), health care sciences and services (5,840, 20.29%), and general and internal medicine (3,783, 13.14%). The top 10 journals had published 2,969 (10.31%) articles and received 5,229 local citations and 40,271 global citations. The top 20 authors together contributed 628 papers, which accounted for a 2.18% share in the cumulative worldwide publications. The most productive author was McKee, from the London School of Hygiene & Tropical Medicine, with 48 articles. In addition, USA and American institutions ranked the first in health system research productivity, with high citation times, followed by the UK and Canada.
  
  
  CONCLUSIONS
  HSR is an interdisciplinary area. Organization for Economic Co-operation and Development countries showed they are the leading nations in HSR. Meanwhile, American and Canadian institutions and the World Health Organization play a dominant role in the production, collaboration, and citation of high quality articles. Moreover, health policy and analysis research, health systems and sub-systems research, healthcare and services research, health, epidemiology and economics of communicable and non-communicable diseases, primary care research, health economics and health costs, and pharmacy of hospital have been identified as the mainstream topics in HSR fields. These findings will provide evidence of the current status and trends in HSR all over the world, as well as clues to the impact of this popular topic; thus, helping scientific researchers and policy makers understand the panorama of HSR and predict the dynamic directions of research.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Yao
authors.forename: Kai
authors.initials: K
authors.lastname: Chen
authors.forename: Lan
authors.initials: L
authors.lastname: Yao
authors.forename: Peng-hui
authors.initials: PH
authors.lastname: Lyu
authors.forename: Tian-an
authors.initials: TA
authors.lastname: Yang
authors.forename: Fei
authors.initials: F
authors.lastname: Luo
authors.forename: Shan-quan
authors.initials: SQ
authors.lastname: Chen
authors.forename: Lu-yang
authors.initials: LY
authors.lastname: He
authors.affiliation: School of Medicine and Health Management, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China. zhiyongliu@hust.edu.cn.
authors.forename: Zhi-yong
authors.initials: ZY
authors.lastname: Liu
mesh_terms: D015706:Bibliometrics; D003299:Cooperative Behavior; D014943:Global Health / Q000706:statistics & numerical data / Q000639:trends*; D006302:Health Services Research / Q000639:trends*; D007373:Interinstitutional Relations; D007391:International Cooperation; D007400:Interprofessional Relations; D010506:Periodicals as Topic / Q000706:statistics & numerical data / Q000639:trends