Multiple Sclerosis Journal
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Multiple Sclerosis Journal http://msj.sagepub.com/ Bibliometric profile of the global scientific research on multiple sclerosis (2003−2012) Rafael Aleixandre-Benavent, Adolfo Alonso-Arroyo, Javier González de Dios, Antonio Vidal-Infer, María González-Muñoz and Ángel P Sempere Mult Scler published online 25 September 2014 DOI: 10.1177/1352458514540357 The online version of this article can be found at: http://msj.sagepub.com/content/early/2014/09/11/1352458514540357 Published by: http://www.sagepublications.com On behalf of: European Committee for Treatment and Research in Multiple Sclerosis Americas Committee for Treatment and Research in Multiple Sclerosis Pan-Asian Committee for Treatment and Research in Multiple Sclerosis Latin American Committee on Treatment and Research of Multiple Sclerosis Additional services and information for Multiple Sclerosis Journal can be found at: Email Alerts: http://msj.sagepub.com/cgi/alerts Subscriptions: http://msj.sagepub.com/subscriptions Reprints: http://www.sagepub.com/journalsReprints.nav Permissions:Downloaded http://www.sagepub.com/journalsPermissions.nav from msj.sagepub.com by Angel Perez Sempere on October 4, 2014 >> OnlineFirst Version of Record - Sep 25, 2014 What is This? Downloaded from msj.sagepub.com by Angel Perez Sempere on October 4, 2014 MSJ0010.1177/1352458514540357Multiple Sclerosis JournalR Aleixandre-Benavent, A Alonso-Arroyo 540357research-article2014 MULTIPLE SCLEROSIS MSJ JOURNAL Research Paper Multiple Sclerosis Journal Bibliometric profile of the global scientific 1 –11 DOI: 10.1177/ research on multiple sclerosis (2003–2012) 1352458514540357 © The Author(s), 2014. Reprints and permissions: Rafael Aleixandre-Benavent, Adolfo Alonso-Arroyo, Javier González de Dios, http://www.sagepub.co.uk/ Antonio Vidal-Infer, María González-Muñoz and Ángel P Sempere journalsPermissions.nav Abstract Background and objectives: The aim of this paper is to analyse the scientific research on multiple sclerosis using a bibliographic analysis of articles published during the period 2003–2012. Methods: The items under study were obtained from the Science Citation Index-Expanded (SCI-E) database, which was accessed through the Web of Science (WOS) platform. All records with the term ‘multiple sclerosis’ in the title, plus all articles published in the journals Multiple Sclerosis and Multiple Sclerosis Journal, were analysed. Results: A total of 9778 articles, with 160,966 citations, were retrieved on multiple sclerosis, and the majority of the articles were published in Multiple Sclerosis Journal (n = 1511). The articles were pub- lished in journals belonging to 135 different subject areas, with the greatest number of papers falling under the category of clinical neurology. The countries that published the largest numbers of articles were the United States (US) (n = 2786), Italy (n = 1263), the United Kingdom (n = 1147) and Germany (n = 1018). International collaborations produced 20.4% of the papers. Conclusions: We emphasise the progressive growth of publications worldwide, the publication of articles in a wide variety of journals covering numerous subject areas, and the research leadership of Western countries, most notably European countries, the US and Canada. Keywords: Multiple sclerosis, articles, citations, impact factor, scientific collaboration Correspondence to: Rafael Aleixandre- Benavent Date received: 17 February 2014; revised: 9 May 2014; accepted: 20 May 2014 Instituto de Historia de la Medicina y de la Ciencia López Piñero, Plaza Cisneros, 4, 46003-Valencia, Spain. [email protected] Introduction have been published in scientific journals. In January Rafael Aleixandre- Multiple sclerosis (MS) is a chronic neurologic dis- 2014, the PubMed database included 42,397 articles Benavent Instituto de Historia de la ease characterised by inflammation, demyelination, classified using the medical subject headings (MeSH) Medicina y de la Ciencia gliosis and neuronal loss. It strikes young adults and is term ‘multiple sclerosis’. Of these articles, 2952 arti- López Piñero, UISYS (Spanish Research Council- eventually disabling for many patients.1 Although the cles reported clinical trials, including 1131 ran- CSIC-Universitat de causes of MS are still unknown, thanks to global domised controlled trials, 6821 review articles and València), Spain Adolfo Alonso-Arroyo research efforts, clear clues concerning the factors that 198 meta-analyses. Moreover, the growth of this Antonio Vidal-Infer influence the risk of developing MS are emerging. research can be considered exponential: A total of 116 Universitat de València, works from 1950 were included in the database, while Spain Javier González de Dios The prevalence of MS in the population has doubled there were 572 by 1990. In 2012, this figure rose to Servicio de Pediatría, over the past 15 years, and the proportion of women 2277. Some bibliometric studies have analysed the Hospital General Universitario de Alicante, who suffer from this disease compared to men has bibliometric profile of research on this disease in par- Spain/Universidad Miguel increased. MS affects more than 400,000 individuals ticular countries and during specific time periods, but Hernández, Spain in the United States (US), around 600,000 people in these features are currently unknown at the global María González-Muñoz Facultad de Medicina y 2 3–6 Europe and as many as 2 million people worldwide. level. Odontología, Universidad de Valencia, Spain An indicator of the social health importance of the The aim of this article is to analyse the scientific Ángel P Sempere Hospital General de Alicante, disease is the number of articles on this disease that research on MS using a bibliographic analysis of the Spain http://msj.sagepub.com 1 Downloaded from msj.sagepub.com by Angel Perez Sempere on October 4, 2014 Multiple Sclerosis Journal articles included in the Web of Science databases of all authors publishing the articles, including depart- (WoS) during the period 2003–2012. The identifica- ment, institution and country. The analysis of scien- tion of some of the bibliometric characteristics of sci- tific collaboration among countries was performed entific research on MS can help young researchers using social network analysis (SNA). The Pajek soft- better understand the field and/or acquire more ware, which was designed for the analysis and visu- knowledge concerning the current research trends, alisation of networks, was used for the construction their impact and ongoing scientific collaboration. and graphical representation of the collaboration between countries.7 The collaboration index between authors was determined by calculating the mean num- Methods ber of signatories per work. The items under study were obtained from the Science Citation Index-Expanded (SCI-E) database, which was accessed through the WoS platform maintained Results by Thomson Reuters. The study period was limited to the decade 2003–2012. All records with the term General data ‘multiple sclerosis’ in the title, plus all articles pub- During the 2003–2012 period, 9778 articles were lished in the journals Multiple Sclerosis and Multiple retrieved in WoS on MS; of these articles, 41.3% were Sclerosis Journal, were analysed. We also limited the published in the first five-year period, and 58.7% search to Document Types=Article. The search was were published in the second five-year period. The conducted in the field ‘title’ of the records for higher highest number of articles was published in 2012. accuracy in the results. These articles received 160,996 citations. The growth rate from 2003 to 2012 was 82.18%. Figure 1 shows The records obtained were transferred to a Microsoft the evolution of the number of published articles and Access database, which allowed us to manage the citations. information contained in the records and to extract bibliometric indicators. Journals The main productivity indicators that were identified The papers were published in 1124 journals, of included the annual evolution of papers published, the which 27 journals published more than 50 articles growth rate in the decade, the journal distribution and (Table 1). The journal that published the largest the subject area distribution. The main identified indi- share of the articles was Multiple Sclerosis Journal cators of scientific production included the annual (n = 1511), while four other journals published more evolution of published papers, the growth rate, the than 300 articles each: Journal of Neuroimmunology journal distribution and the subject area distribution. (n = 419), Journal of the Neurological Sciences (n = The growth rate in the decade 2003–2012 (percentage 381), Neurology (n = 309) and Journal of Neurology change from 2003 to 2012) is calculated as follows: (n = 304). Multiple Sclerosis Journal received the (papers published in 2012– papers published 2003/ greatest number of citations (n = 19,888), followed papers published in 2003) × 100. by Neurology (n = 10,143) and Annals of Neurology (n = 8889). However, the ratio of citations (C) per As indicators of impact, the number of citations that article (A) in the most productive journals was greater each article received was also determined, as well as for Annals of Neurology (C/A=62.2), followed by the average number of citations per paper and journal; Neurology (C/A=32.8), Journal of Immunology (C/ the impact factors of the journals were extracted from A=32.6) and Neuroimage (C/A=28.6). It should be the Journal Citation Reports (2012 edition) (JCR).