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Objectives: Bibliometric analysis can provide insight into the growth, development and dissemination of research in neurosurgery. Little work has been done to examine the role of country-specific characteristics affecting research productivity. We aimed to characterize andcompare the research productivity among SEA countries in terms of bibliometric indicesand determine associations with country-specific factors., Methods: We performed a systematic search of all articles by authors affiliated with a neurosurgical department in any of the Southeast Asian countries, indexed in 3 databases from inception to June 10, 2020. Bibliometric indices - number of publications, number of citations, average citations per publication, h-index, and the i-10-index - were computed for each country. Correlations between the indices and country-specific characteristics (population size, GDP per capita, percentage of GDP allocation to research and development (R&D), number of neurosurgeons, number of neurosurgeons per capita, and number of collaborations with non-SEA authors) were determined., Results: The number of publications showed an increasing trend up to 2019. Most studies were cohort studies (37%) or case reports or series (37%). Of the country-specific factors analyzed, only percentage of the GDP allocated to R&D was positively correlated with number of publications (p = 0.0004), total citations (p < 0.0001), H-index (p < 0.0001), and i(10)-index (p < 0.0001). Number of collaborations also positively correlated with the same indices., Conclusion: Our bibliometric analysis showed increasing contribution by neurosurgeons in the SEA region. Correlational analysis support the view that increased R&D budget allocation and international collaboration can improve neurosurgical research capacity and productivity., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022 Elsevier Ltd. All rights reserved.)

Background: Although headache is one of the most common neurologic conditions with a high disease burden, primary data on headache research from Southeast Asia (SEA) was hypothesized to be inadequate. This study aimed to evaluate research productivity among the different countries in SEA and to determine the association between specific bibliometric indices and socioeconomic factors., Methods: A systematic search was conducted until June 10, 2020 in Scopus, PubMed, Embase, Cochrane Central Register of Controlled Trials, and Index Medicus for South-East Asia Region to include all primary headache studies on migraine, tension-type headache, and trigeminal autonomic cephalalgia, with at least one author affiliated with a SEA country. Bibliometric indices, such as the number of publications and PlumX metrics, were obtained and correlated with the country-specific socioeconomic factors., Results: We identified 153 articles. Most of the publications (n = 43, 28.1%) were epidemiologic studies and case reports/series (n = 25, 16.3%). Migraine was the most studied primary headache subtype. Malaysia, Singapore, and Thailand were the major contributors to primary headache research in SEA. Only the percent gross domestic product for research and development correlated significantly with research productivity., Conclusion: Despite the high global burden of disease, research productivity on primary headache was low in SEA. The move towards a knowledge-based economy may drive research productivity in SEA.

Background: The status of research and scientific outputs with regards to bacterial central nervous system (CNS) infection in southeast Asia (SEA) is unknown. This study aimed to analyze and compare bacterial CNS infection research output of SEA countries in terms of bibliometric indices., Methods: The major electronic databases (MEDLINE, Scopus, Embase, CENTRAL, Clinicaltrials.gov and WPRIM) were searched for studies on bacterial CNS infection in SEA until August 31, 2020. Frequencies, percentages and Spearman's rho correlations were used., Results: There was a total of 648 unique studies on bacterial CNS infection in SEA and it was 657 when double-counted (collaborative studies between SEA countries). Thailand (n=148, 22.5%) and Vietnam (n=142, 21.6%) had the highest number of publications. The most common type of research publication was the case report / case series (n=160, 24.7%). Tuberculous meningitis/tuberculoma (n=176, 26.7%) was the most common topic. This study showed that the %GDP for research and development (R&D) was associated with a higher number of research output. However, the GDP per capita was not associated with any of the bibliometric indices. The total number of neurologists was associated with all of the bibliometric analysis., Conclusion: Bacterial CNS infection research output in SEA countries was low in terms of quantity. The %GDP for R&D was associated with the number of research publications. The total number of neurologists was associated with all of the bibliometric indices.

Background: The number of scientific publications on movement disorders from Southeast Asia (SEA) is thought to be low. Thus, we looked at the movement disorders research productivity among SEA countries and its associations with country-specific socioeconomic factors., Methods: We performed a systematic search for publications indexed in PubMed, Scopus, Embase and Cochrane Central Register of Controlled Trials from January 2000 to December 2019 with at least one author from SEA. Bibliometric indices were used to evaluate research impact. The country-specific socioeconomic characteristics were also obtained., Results: Of the 9488 identified articles, 1567 met the eligibility criteria. There was an increasing trend in the total number of publications on movement disorders during the last two decades. Singapore had the highest contribution in all aspects, which highlights the impact of knowledge-based economy type in research productivity. Parkinsonism remained the most studied condition, followed by dystonia, chorea, and tremor. Among the socioeconomic factors, only % gross domestic product (GDP) for research and development showed a positive correlation on the number of publications of a country. On the other hand, GDP per capita, population size and the number of neurologist size did not affect research productivity., Conclusions: An increasing trend in the movement disorders research output over the last 20 years was seen. Singapore had the highest contribution in all aspects which highlights the impact of economy in research productivity. Among the socioeconomic factors, only % GDP for R&D showed a positive impact on the number of publications of a country., (Copyright © 2020 Elsevier Ltd. All rights reserved.)

Background: Scientific productivity in the Southeast Asian (SEA) region in the field of multiple sclerosis and neuromyelitis optica spectrum disorder (MS/ NMOSD) was hypothesized to be low in magnitude. The aim of this study was to determine and compare MS/ NMOSD research outputs among the SEA countries in terms of established bibliometric indices. The association between these productivity indices and relevant country-specific socioeconomic factors was also determined., Methods: A systematic review was conducted to include all relevant published MS/ NMOSD studies in the SEA indexed in MEDLINE, Embase, Scopus and CENTRAL from the inception of these databases to August 1, 2019. Quantity of research productivity was measured in terms of the total published documents. Quality of research impact was evaluated by assessing the study designs of the published reports, publications in journals with impact factor (IF) and PlumX Metrics (citations, usage, captures, mentions and social medias). Population size, gross domestic product (GDP) per capita, percentage (%) of GDP allocated to research and development (R&D), and the total number of neurologists reported in each country were obtained from reliable published data., Results: Out of 3,547 articles identified, only 142 articles fulfilled the eligibility criteria; therefore, the total number of publications in the SEA region related to MS/ NMOSD was deemed low in quantity. Most studies were cross-sectional and case reports/ series; hence, most studies offered low level of evidence. Since the aggregate scores in citations, usage, captures, mentions, and social medias in PlumX Metrics and publications in journals with IF were low, the overall quality of the published articles was considered low. Thailand (57 articles), Malaysia (40) and Singapore (29) contributed to the majority of publications on the topic-. GDP per capita was statistically correlated with usage. Percent GDP for R&D was positively correlated with total publications, usage, captures and social mediaindices., Conclusion: In conclusion, the scientific impact of MS/ NMOSD in the SEA was considered low in quantity and quality. This study must encourage researchers in the SEA to produce greater volumes of high-quality publications in this particular field and motivate governments to increase % GDP for R&D for the benefit of patients suffering fromthese rare and disabling conditions., Competing Interests: Declaration of Competing Interest The authors have nothing to disclose., (Copyright © 2019 Elsevier B.V. All rights reserved.)

Background: Scientific output in Southeast Asia (SEA) on the topic of dementia is postulated to be low in quality and quantity. It is also speculated that certain socioeconomic variables and measures of disease burden for dementia may play a significant role in driving the research output of a particular country., Objective: This study aimed to determine the research impact of published journal articles on dementia in SEA and its association with country-level socioeconomic factors and measures of disease burden for dementia., Methods: A systematic search was conducted using electronic healthcare databases. We included articles published on dementia until August 2019 with at least 1 author affiliated with any SEA institution. We obtained bibliometric indices, relevant socioeconomic factors, and measures of disease burden for dementia from published sources., Results: One thousand six articles fulfilled the inclusion criteria. The majority of publications were related to Alzheimer's disease (n = 775, 77.0%). Singapore contributed the highest number of publications (n = 457, 45.4%). Gross domestic product (GDP) per capita, % GDP for research and development, and total neurologists significantly correlated with several bibliometric indices. On the other hand, the measures of disease burden for dementia in SEA countries were not significantly associated with research productivity., Conclusion: Research productivity in SEA on dementia has substantially increased in recent years. Augmenting GDP per capita and expanding the apportionment of resources to research and development (R&D) may have a significant role in the advancement of dementia research in SEA.