4Chen C. CiteSpace 11 : Detecting and visualizing emerging trends and transient patterns in scientific literature [ J ]. Joulal of the American Society for Information Science and Technology ,2006, 57 (3) :359 - 377.
5Chen C, Hu Z, Liu S, et al. Emerging trends in regenerative medi- cine:a scientometric analysis in CiteSpace [ J ]. Expert Opinion on Biological Therapy,2012,12(5) :593 -608.
6Khalil GM, Cmwford CAG. A bibliometric analysis of U. S. -based research on the behavioral risk factor surveillance system[ J ]. Ameri- can Journal of Preventive Medicine,2015,48( 1 ) :50 -57.
