title: Scientific publications on primary biliary cirrhosis from 2000 through 2010: an 11-year survey of the literature.
abstract: BACKGROUND
  Primary biliary cirrhosis (PBC) is a chronic liver disease characterized by intrahepatic bile-duct destruction, cholestasis, and fibrosis. It can lead to cirrhosis and eventually liver failure. PBC also shows some regional differences with respect to incidence and prevalence that are becoming more pronounced each year. Recently, researchers have paid more attention to PBC. To evaluate the development of PBC research during the past 11 years, we determined the quantity and quality of articles on this subject. We also compared the contributions of scientists from the US, UK, Japan, Italy, Germany, and China.
  
  
  METHODS
  The English-language papers covering PBC published in journals from 2000 through 2010 were retrieved from the PubMed database. We recorded the number of papers published each year, analyzed the publication type, and calculated the accumulated, average impact factors (IFs) and citations from every country. The quantity and quality of articles on PBC were compared by country. We also contrasted the level of PBC research in China and other countries.
  
  
  RESULTS
  The total number of articles did not significantly increase during the past 11 years. The number of articles from the US exceeded those from any other country; the publications from the US also had the highest IFs and the most citations. Four other countries showed complex trends with respect to the quantity and quality of articles about PBC.
  
  
  CONCLUSIONS
  The researchers from the US have contributed the most to the development of PBC research. They currently represent the highest level of research. Some high-level studies, such as RCTs, meta-analyses, and in-depth basic studies should be launched. The gap between China and the advanced level is still enormous. Chinese investigators still have a long way to go.
authors.affiliation: Department of Laboratory Diagnostics, Changzheng Hospital, Second Military Medical University, Shanghai, China.
authors.forename: Baodong
authors.initials: B
authors.lastname: Qin
authors.forename: Yan
authors.initials: Y
authors.lastname: Liang
authors.forename: Zaixing
authors.initials: Z
authors.lastname: Yang
authors.forename: Renqian
authors.initials: R
authors.lastname: Zhong
mesh_terms: D015706:Bibliometrics; D035843:Biomedical Research; D002681:China; D003625:Data Collection; D005858:Germany; D006801:Humans; D007558:Italy; D007564:Japan; D055811:Journal Impact Factor; D008105:Liver Cirrhosis, Biliary; D039781:PubMed; D011642:Publications; D006113:United Kingdom; D014481:United States