Xander Koolman

3.9k total citations · 1 hit paper
72 papers, 2.7k citations indexed

About

Xander Koolman is a scholar working on General Health Professions, Economics and Econometrics and Health. According to data from OpenAlex, Xander Koolman has authored 72 papers receiving a total of 2.7k indexed citations (citations by other indexed papers that have themselves been cited), including 48 papers in General Health Professions, 45 papers in Economics and Econometrics and 12 papers in Health. Recurrent topics in Xander Koolman's work include Health Systems, Economic Evaluations, Quality of Life (28 papers), Global Health Care Issues (27 papers) and Healthcare Policy and Management (27 papers). Xander Koolman is often cited by papers focused on Health Systems, Economic Evaluations, Quality of Life (28 papers), Global Health Care Issues (27 papers) and Healthcare Policy and Management (27 papers). Xander Koolman collaborates with scholars based in Netherlands, Australia and South Africa. Xander Koolman's co-authors include Eddy van Doorslaer, Andrew M. Jones, Elly Stolk, Gert P. Westert, Richard Heijink, Nigel Rice, Patrick Jeurissen, Niek Stadhouders, Anna P. Nieboer and Marc Koopmanschap and has published in prestigious journals such as SHILAP Revista de lepidopterología, American Journal of Epidemiology and The Lancet Neurology.

In The Last Decade

Xander Koolman

66 papers receiving 2.6k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Explaining income‐related inequalities in doctor utilisation in Europe

2004 536 citations Eddy van Doorslaer, Xander Koolman et al. Health Economics profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Xander Koolman Netherlands	25	1.6k	1.1k	681	668	402	72	2.7k
Sarah Thomson United Kingdom	27	2.1k 1.3×	1.2k 1.1×	504 0.7×	424 0.6×	142 0.4×	83	3.1k
Zhongliang Zhou China	21	1.1k 0.7×	649 0.6×	381 0.6×	1.0k 1.5×	468 1.2×	76	2.0k
Marina Karanikolos United Kingdom	27	2.5k 1.5×	657 0.6×	1.1k 1.6×	346 0.5×	208 0.5×	70	3.6k
Sara Allin Canada	26	1.3k 0.8×	681 0.6×	416 0.6×	391 0.6×	297 0.7×	107	2.4k
Heidi Allen United States	18	2.2k 1.3×	2.1k 1.9×	427 0.6×	423 0.6×	135 0.3×	46	3.1k
Bill Wright United States	20	2.3k 1.4×	2.2k 1.9×	451 0.7×	418 0.6×	124 0.3×	59	3.3k
Sarah Taubman United States	14	2.2k 1.3×	2.2k 1.9×	409 0.6×	407 0.6×	132 0.3×	14	3.4k
Thomas Hone United Kingdom	23	1.4k 0.8×	496 0.4×	355 0.5×	611 0.9×	538 1.3×	71	2.6k
Helen Levy United States	24	1.6k 1.0×	1.2k 1.1×	306 0.4×	236 0.4×	119 0.3×	82	2.5k
Cristina Hernández‐Quevedo United Kingdom	24	1.1k 0.7×	503 0.4×	344 0.5×	254 0.4×	125 0.3×	55	1.9k

Countries citing papers authored by Xander Koolman

Since Specialization

Citations

This map shows the geographic impact of Xander Koolman's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Xander Koolman with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Xander Koolman more than expected).

Fields of papers citing papers by Xander Koolman

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Xander Koolman. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Xander Koolman. The network helps show where Xander Koolman may publish in the future.

Co-authorship network of co-authors of Xander Koolman

This figure shows the co-authorship network connecting the top 25 collaborators of Xander Koolman. A scholar is included among the top collaborators of Xander Koolman based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Xander Koolman. Xander Koolman is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Portrait, France, et al.. (2023). Practice variation in the stepped care approach to idiopathic heavy menstrual bleeding: A population-based study. European Journal of Obstetrics & Gynecology and Reproductive Biology. 283. 6–12. 1 indexed citations

Stadhouders, Niek, Xander Koolman, Marit A.C. Tanke, Hans Maarse, & Patrick Jeurissen. (2023). Measuring Active Purchasing in Healthcare: Analysing Reallocations of Funds Between Providers to Evaluate Purchasing Systems Performance in the Netherlands. International Journal of Health Policy and Management. 12. 7506–7506.

Koolman, Xander, et al.. (2022). Provider responses to discontinuous tariffs: evidence from Dutch rehabilitation care. International Journal of Health Economics and Management. 22(3). 333–354.

Portrait, France, et al.. (2022). Do patients’ preferences prevail in hospital selection?: a comparison between discrete choice experiments and revealed hospital choice. BMC Health Services Research. 22(1). 1136–1136. 13 indexed citations

Koolman, Xander, et al.. (2021). Height and marital outcomes in the Netherlands, birth years 1841-1900. Economics & Human Biology. 41. 100970–100970. 6 indexed citations

Luijendijk, Hendrika J., Matthew J. Page, Huibert Burger, & Xander Koolman. (2020). Assessing risk of bias: a proposal for a unified framework for observational studies and randomized trials. BMC Medical Research Methodology. 20(1). 237–237. 7 indexed citations

Koolman, Xander, et al.. (2020). The Dutch COVID-19 approach: Regional differences in a small country. Health Policy and Technology. 9(4). 613–622. 41 indexed citations

Portrait, France, et al.. (2019). Global budget versus cost ceiling: a natural experiment in hospital payment reform in the Netherlands. The European Journal of Health Economics. 21(1). 105–114. 15 indexed citations

Stadhouders, Niek, Florien Margareth Kruse, Marit A.C. Tanke, Xander Koolman, & Patrick Jeurissen. (2018). Effective healthcare cost-containment policies: A systematic review. Health Policy. 123(1). 71–79. 99 indexed citations

10.

Portrait, France, et al.. (2018). The effect of cost-sharing design characteristics on use of health care recommended by the treating physician; a discrete choice experiment. BMC Health Services Research. 18(1). 797–797. 10 indexed citations

11.

Vries, Nienke M. de, Lieke H.H.M. Boonen, Xander Koolman, et al.. (2017). Effectiveness and costs of specialised physiotherapy given via ParkinsonNet: a retrospective analysis of medical claims data. The Lancet Neurology. 17(2). 153–161. 101 indexed citations

12.

Luijendijk, Hendrika J., Natasja de Bruin, & Xander Koolman. (2013). HALOPERIDOL IN ELDERLY USERS: NOT A CAUSE OF DEATH, BUT CAUSED BY IMPENDING DEATH?. American Journal of Epidemiology. 177. 2 indexed citations

13.

Franken, M & Xander Koolman. (2013). Health system goals: A discrete choice experiment to obtain societal valuations. Health Policy. 112(1-2). 28–34. 27 indexed citations

14.

Koolman, Xander, et al.. (2013). The use of quality information by general practitioners: does it alter choices? A randomized clustered study. BMC Family Practice. 14(1). 95–95. 15 indexed citations

15.

Luijendijk, Hendrika J. & Xander Koolman. (2012). The incentive to publish negative studies: how beta-blockers and depression got stuck in the publication cycle. Journal of Clinical Epidemiology. 65(5). 488–492. 19 indexed citations

16.

Heijink, Richard, Xander Koolman, & Gert P. Westert. (2012). Spending more money, saving more lives? The relationship between avoidable mortality and healthcare spending in 14 countries. The European Journal of Health Economics. 14(3). 527–538. 71 indexed citations

17.

Empel, I. W. H. van, Eline Dancet, Xander Koolman, et al.. (2011). Physicians underestimate the importance of patient-centredness to patients: a discrete choice experiment in fertility care. Human Reproduction. 26(3). 584–593. 97 indexed citations

18.

Nooten, Floortje van, Xander Koolman, & Werner Brouwer. (2008). The influence of subjective life expectancy on health state valuations using a 10 year TTO. Health Economics. 18(5). 549–558. 53 indexed citations

19.

Ourti, Tom Van, Eddy van Doorslaer, & Xander Koolman. (2008). The effect of income growth and inequality on health inequality: Theory and empirical evidence from the European Panel. Journal of Health Economics. 28(3). 525–539. 51 indexed citations

20.

Koolman, Xander, et al.. (2007). The Effect of Micro Health Insurance on Gender Inequity in Utilization of Health Care in India. SSRN Electronic Journal. 1 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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