title: Current use of medical eponyms--a need for global uniformity in scientific publications.
abstract: BACKGROUND
  Although eponyms are widely used in medicine, they arbitrarily alternate between the possessive and nonpossessive forms. As very little is known regarding extent and distribution of this variation, the present study was planned to assess current use of eponymous term taking "Down syndrome" and "Down's syndrome" as an example.
  
  
  METHODS
  This study was carried out in two phases - first phase in 1998 and second phase in 2008. In the first phase, we manually searched the terms "Down syndrome" and "Down's syndrome" in the indexes of 70 medical books, and 46 medical journals. In second phase, we performed PubMed search with both the terms, followed by text-word search for the same.
  
  
  RESULTS
  In the first phase, there was an overall tilt towards possessive form - 62(53.4%) "Down's syndrome" versus 54(46.6%) "Down syndrome." However, the American publications preferred the nonpossesive form when compared with their European counterpart (40/50 versus 14/66; P < 0.001). In the second phase, PubMed search showed, compared to "Down syndrome," term "Down's syndrome" yielded approximately 5% more articles. The text-word search of both forms between January 1970 and June 2008 showed a gradual shift from "Down's syndrome" to "Down syndrome," and over the last 20 years, the frequency of the former was approximately halved (33.7% versus 16.5%; P < 0.001). The abstracts having possessive form were mostly published from the European countries, while most American publications used nonpossesive form consistently.
  
  
  CONCLUSIONS
  Inconsistency in the use of medical eponyms remains a major problem in literature search. Because of linguistic simplicity and technical advantages, the nonpossessive form should be used uniformly worldwide.
authors.affiliation: Department of Obstetrics and Gynaecology, Institute of Postgraduate Medical Education and Research, Kolkata 700020, India. njana1@vsnl.net
authors.forename: Narayan
authors.initials: N
authors.lastname: Jana
authors.forename: Sukumar
authors.initials: S
authors.lastname: Barik
authors.forename: Nalini
authors.initials: N
authors.lastname: Arora
mesh_terms: D015706:Bibliometrics; D004314:Down Syndrome / Q000145:classification; D004850:Eponyms; D006801:Humans; D011643:Publishing / Q000592:standards*