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Mark G. Burnett, Sherman C. Stein and M. Sean Grady

international journals. J Neurol 249 : 390 – 395 , 2002 Mela GS, Mancardi GL: Neurological research in Europe, as assessed with a four-year overview of neurological science international journals. J Neurol 249: 390–395, 2002 20. Mela GS , Martinoli C , Poggi E , et al : Radiological research in Europe: a bibliometric study. Eur Radiol 13 : 657 – 662 , 2003 Mela GS, Martinoli C, Poggi E, et al: Radiological research in Europe: a bibliometric study. Eur Radiol 13: 657–662, 2003 21. Mylonas C

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Janet Lee, Kristin L. Kraus and William T. Couldwell

Object

Assessing academic productivity through simple quantification may overlook key information, and the use of statistical enumeration of academic output is growing. The h index, which incorporates both the total number of publications and the citations of those publications, has been recently proposed as an objective measure of academic productivity. The authors used several tools to calculate the h index for academic neurosurgeons to provide a basis for evaluating publishing by physicians.

Methods

The h index of randomly selected academic neurosurgeons from a sample of one-third of the academic programs in the US was calculated using data from Google Scholar and from the Scopus database. The mean h index for each academic rank was determined. The h indices were also correlated with various other factors (such as time spent practicing neurosurgery, authorship position) to identify how these factors influenced the h index. The h indices were then compared with other citation statistics to evaluate the robustness of this metric. Finally, h indices were also calculated for a sampling of physicians in other medical specialties for comparison.

Results

As expected, the h index increased with academic rank and there was a statistically significant difference between each rank. A weighting based on position of authorship did not affect h indices. The h index was positively correlated with time since American Board of Neurological Surgery certification, and it was also correlated with other citation metrics. A comparison among medical specialties supports the assertion that h index values may not be comparable between fields, even closely related specialties.

Conclusions

The h index appears to be a robust statistic for comparing academic output of neurosurgeons. Within the field of academic neurosurgery, clear differences of h indices between academic ranks exist. On average, an increase of the h index by 5 appears to correspond to the next highest academic rank, with the exception of chairperson. The h index can be used as a tool, along with other evaluations, to evaluate an individual's productivity in the academic advancement process within the field of neurosurgery but should not be used for comparisons across medical specialties.

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Francisco A. Ponce and Andres M. Lozano

journals. The study and analysis of citation indexes, or bibliometrics, have resulted in the development of various metrics to assess the impact of scientific journals or individual investigators based on the number of citations to their respective works. In the present study, we take advantage of these tools, not readily available in the past, to identify the important works in neurosurgery. The study is presented in 2 parts. In this first part, we identify the 100 top-cited articles published in neurosurgical journals since 1950 and provide an analysis of the fields

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Francisco A. Ponce and Andres M. Lozano

performed by “topic” using the bibliometric database Web of Science up to August of 2009. TABLE 1: Search phrases used Field Search Strings general/other brain surgery – neurosurgery – hydrocephalus – peripheral nerve surgery vascular aneurysm surgery – arteriovenous malformation * – carotid endarterectomy – cavernous malformation – extracranial intracranial bypass – intracranial aneurysm * – [intracranial or intracerebral] and [hematoma or hemorrhage] – subarachnoid hemorrhage – vasospasm tumor brain tumor surgery

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Francisco A. Ponce and Andres M. Lozano

. Methods Departments of neurosurgery in the US (including Puerto Rico) and Canada with residency programs were analyzed. The list of residency programs for the US was obtained from the FREIDA website ( http://www.ama-assn.org/go/freida ) and the Society of Neurological Surgeons ( http://www.societyns.org/ ). The list of Canadian residency programs in neurosurgery was obtained from the Royal College of Physicians and Surgeons of Canada website ( http://rcpsc.medical.org/ ). The bibliometric data were gathered from the Thomson's ISI Web of Science database in December

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Christopher M. Spearman, Madeline J. Quigley, Matthew R. Quigley and Jack E. Wilberger

W ith the widespread availability of online databases, bibliometrics are increasingly being used to evaluate academic faculty for promotion and tenure. Traditionally these metrics have included total number of publications, total number of citations, and average number of citations. In 2005, Hirsch, 7 a physicist at the University of California, San Diego, proposed a novel bibliometric to assess the impact of an individual researcher's scientific output. Termed the h index, he defined the metric as the number of publications in an individual's curriculum

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Peter G. Campbell, Olatilewa O. Awe, Mitchell G. Maltenfort, Darius M. Moshfeghi, Theodore Leng, Andrew A. Moshfeghi and John K. Ratliff

provided a summary of the standard bibliometrics including the h-index. Searches were conducted randomly by program in a single week of May 2010 by a single data collector in an attempt to minimize any temporal bias. Statistical Analysis Analysis of variance was performed using the Tukey range test to detect if h-indices were associated with academic rank. All statistical analyses were performed using the SAS-based statistical software package JMP (SAS Institute, Inc.). Significance was defined as p < 0.05. Results Based on departmental websites, 97 (98%) of

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Jason S. Hauptman, Daniel S. Chow, Neil A. Martin and Michael W. Itagaki

examined include study design, overall growth, topics of interest, and NIH influence among articles published in the US. Methods This study was a retrospective bibliometric analysis of a publicly available database, the National Library of Medicine's MEDLINE database, and was exempt from institutional review board approval. Between 1996 and 2009, MEDLINE articles published by first authors affiliated with neurosurgery departments were included. This methodology was described in part previously. 11 Articles indexed by MEDLINE include the first author

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James T. Rutka

.D., Ph.D. 1992–2013 From its first issue, the JNS has been maintained as an international journal accepting neurosurgical submissions from around the world. 1 , 8 The same holds true to this day, with authors from over 60 countries submitting their best work for peer review in 2012. In this era of bibliometrics, we can indeed be proud of the JNS , which, from 2011 data, has a 5-year Impact Factor (IF) of 3.088, and total citations of 28,800, which is more than any other neurosurgical journal. The proliferation of neurosurgical centers throughout the world and

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Jau-Ching Wu, Chin-Chu Ko, Yu-Shu Yen, Wen-Cheng Huang, Yu-Chun Chen, Laura Liu, Tsung-Hsi Tu, Su-Shun Lo and Henrich Cheng

. Administrative/technical/material support: Lo, Cheng. Study supervision: Lo, Cheng. References 1 Baron EM , Young WF : Cervical spondylotic myelopathy: a brief review of its pathophysiology, clinical course, and diagnosis . Neurosurgery 60 : 1 Suppl 1 S35 – S41 , 2007 2 Chen YC , Yeh HY , Wu JC , Haschler I , Chen TJ , Wetter T : Taiwan's national health insurance research database: administrative health care database as study object in bibliometrics . Scientometrics 86 : 365 – 380 , 2011 3 Cheng CL , Kao YH , Lin SJ , Lee