Ola Olén

8.8k total citations · 3 hit papers
203 papers, 5.4k citations indexed

About

Ola Olén is a scholar working on Genetics, Epidemiology and Surgery. According to data from OpenAlex, Ola Olén has authored 203 papers receiving a total of 5.4k indexed citations (citations by other indexed papers that have themselves been cited), including 125 papers in Genetics, 110 papers in Epidemiology and 85 papers in Surgery. Recurrent topics in Ola Olén's work include Inflammatory Bowel Disease (121 papers), Microscopic Colitis (106 papers) and Gastrointestinal motility and disorders (35 papers). Ola Olén is often cited by papers focused on Inflammatory Bowel Disease (121 papers), Microscopic Colitis (106 papers) and Gastrointestinal motility and disorders (35 papers). Ola Olén collaborates with scholars based in Sweden, United States and United Kingdom. Ola Olén's co-authors include Jonas F. Ludvigsson, Martin Neovius, Jonas Halfvarson, Michael C. Sachs, Johan Askling, Gustaf Bruze, Pia Svedberg, Hamed Khalili, Anders Ekbom and Pär Myrelid and has published in prestigious journals such as The Lancet, SHILAP Revista de lepidopterología and Gastroenterology.

In The Last Decade

Ola Olén

185 papers receiving 5.4k 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.

The longitudinal integrated database for health insurance and labour market studies (LISA) and its use in medical research

2019 774 citations Jonas F. Ludvigsson, Ola Olén et al. profile →
Colorectal cancer in ulcerative colitis: a Scandinavian population-based cohort study

2020 321 citations Ola Olén, Rune Erichsen et al. profile →
Diagnostic accuracy in the Swedish national patient register: a review including diagnoses in the outpatient register

2025 11 citations Åsa H. Everhov, Mehdi Osooli et al. profile →

Peers

Countries citing papers authored by Ola Olén

Since Specialization

Citations

This map shows the geographic impact of Ola Olén'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 Ola Olén with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Ola Olén more than expected).

Fields of papers citing papers by Ola Olén

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Ola Olén. 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 Ola Olén. The network helps show where Ola Olén may publish in the future.

Co-authorship network of co-authors of Ola Olén

This figure shows the co-authorship network connecting the top 25 collaborators of Ola Olén. A scholar is included among the top collaborators of Ola Olén 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 Ola Olén. Ola Olén 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

#	Work	Indexed citations
1	Microscopic Colitis and Risk of Venous Thromboembolism: A Nationwide Matched Cohort Study 2025 ·The American Journal of Gastroenterology ·Anders Forss, Gabriella Bröms, David Bergman, Marcus Thuresson, Jiangwei Sun, Carl Eriksson, Ola Olén, Bengt Zöller, Jonas F. Ludvigsson	0
2	Outcomes of inflammatory bowel disease in patients with obesity following bariatric surgery: propensity score-matched cohort study 2025 ·BJS Open ·Erik Stenberg, Åsa H. Everhov, Jonas Söderling, Johan Ottosson, Mehdi Osooli, (unknown), Pär Myrelid, Hans Strid, Caroline Nordenvall, Charlotte Hedin, Susanna Jäghult, (unknown), O Grip, Ulrika L. Fagerberg, Karl Mårild, Ellen Andersson, Daniel Bergemalm, Jonas F. Ludvigsson, Carl Eriksson, Ola Olén	0
3	Histologic Remission and Mortality in Patients With Inflammatory Bowel Disease: A Nationwide Cohort Study 2025 ·Clinical Gastroenterology and Hepatology ·Jiangwei Sun, Karl Mårild, David Bergman, Fahim Ebrahimi, Jonas Halfvarson, Ola Olén, (unknown)	0
4	Childhood-onset inflammatory bowel disease and chronic non-bacterial osteomyelitis: a Swedish nationwide cohort study 2002-2022 2025 ·Journal of Crohn s and Colitis ·(unknown), (unknown), (unknown), Stefan Berg, Robert Saalman, Ola Olén	0
5	The Epidemiology of Inflammatory Bowel Diseases During the COVID-19 Pandemic: Comparison of Two Nationwide Cohorts 2024 ·Journal of Crohn s and Colitis ·Ohad Atia, (unknown), (unknown), (unknown), Amir Ben‐Tov, Mehdi Osooli, Anders Forss, Yiska Loewenberg Weisband, Eran Matz, Iris Dotan, Dan Turner, Ola Olén	5
6	Long-Term Risk of Myocarditis in Patients With Inflammatory Bowel Disease: A Nationwide Cohort Study in Sweden 2024 ·The American Journal of Gastroenterology ·Jiangwei Sun, Jialu Yao, Ola Olén, Jonas Halfvarson, David Bergman, Fahim Ebrahimi, Björn Roelstraete, Annika Rosengren, Johan Sundström, Jonas F. Ludvigsson	0
7	Comparative Risk of Serious Infection With Vedolizumab vs Anti-Tumor Necrosis Factor in Inflammatory Bowel Disease: Results From Nationwide Swedish Registers 2024 ·The American Journal of Gastroenterology ·(unknown), Michael C. Sachs, Carl Eriksson, Yang Cao, Scott Montgomery, Jonas F. Ludvigsson, (unknown), Ola Olén, Jonas Halfvarson	4
8	Risk of Kidney Failure in Patients With Inflammatory Bowel Disease Undergoing Colectomy: A Nationwide Cohort Study 2024 ·Clinical Gastroenterology and Hepatology ·(unknown), Jonas F. Ludvigsson, Anders Forss, Anne‐Laure Faucon, Adam S. Faye, Ola Olén, Arvid Sjölander, Juan Jesús Carrero	3
9	P716 A 2-week course of Exclusive Enteral Nutrition followed by the Crohn Disease Exclusion Diet is effective for Induction and Maintenance of Remission in children with Crohn Disease; the DIETOMICS-CD trial 2023 ·Journal of Crohn s and Colitis ·Rotem Sigall Boneh, Víctor Manuel Navas‐López, Séamus Hussey, (unknown), Sally Lawrence, (unknown), (unknown), Javier Martín‐de‐Carpi, L Abramas, (unknown), (unknown), (unknown), M Hurley, (unknown), Ola Olén, (unknown), (unknown), Johan Van Limbergen, Eytan Wine	2
10	Long-term Risk of Stroke in Patients With Inflammatory Bowel Disease 2023 ·Neurology ·Jiangwei Sun, Jonas Halfvarson, Peter Appelros, David Bergman, Fahim Ebrahimi, Björn Roelstraete, Ola Olén, Jonas F. Ludvigsson	17
11	Statin use and risk of colorectal cancer in patients with inflammatory bowel disease 2023 ·EClinicalMedicine ·Jiangwei Sun, Jonas Halfvarson, David Bergman, Fahim Ebrahimi, Björn Roelstraete, Paul Lochhead, Mingyang Song, Ola Olén, Jonas F. Ludvigsson	19
12	Psychological treatments for irritable bowel syndrome: a comprehensive systematic review and meta-analysis 2023 ·Cognitive Behaviour Therapy ·Erland Axelsson, (unknown), Erik Hedman‐Lagerlöf, Perjohan Lindfors, (unknown), Hugo Hesser, Erik Andersson, Robert Johansson, Ola Olén, Marianne Bonnert, Maria Lalouni, Brjánn Ljótsson	6
13	Estimated Glomerular Filtration Rate and the Risk of Inflammatory Bowel Disease in Adults: A Swedish Population-Based Study 2023 ·Inflammatory Bowel Diseases ·(unknown), Jonas F. Ludvigsson, Ola Olén, Arvid Sjölander, Juan Jesús Carrero	2
14	Eosinophilic esophagitis is associated with increased risk of later inflammatory bowel disease in a nationwide Swedish population cohort 2023 ·United European Gastroenterology Journal ·(unknown), John J. Garber, (unknown), Kathryn A. Peterson, Björn Roelstraete, Ola Olén, Jonas Halfvarson, Jonas F. Ludvigsson	5
15	Predictors of drug survival: A cohort study comparing anti‐tumour necrosis factor agents using the Swedish inflammatory bowel disease quality register 2021 ·Alimentary Pharmacology & Therapeutics ·(unknown), Carl Eriksson, Ola Olén, Yang Cao, (unknown), Olof Grip, Anders Gustavsson, Henrik Hjortswang, Pontus Karling, Scott Montgomery, Pär Myrelid, (unknown), Jonas F. Ludvigsson, Jonas Halfvarson	6
16	Inflammatory bowel disease and risk of small bowel cancer: a binational population-based cohort study from Denmark and Sweden 2020 ·Gut ·Jordan E. Axelrad, Ola Olén, Michael C. Sachs, Rune Erichsen, Lars Pedersen, Jonas Halfvarson, Johan Askling, Anders Ekbom, Henrik Toft Sørensen, Jonas F. Ludvigsson	36
17	Drug survival of anti‐TNF agents compared with vedolizumab as a second‐line biological treatment in inflammatory bowel disease: results from nationwide Swedish registers 2020 ·Alimentary Pharmacology & Therapeutics ·(unknown), Michael C. Sachs, Carl Eriksson, Ola Olén, Scott Montgomery, Jonas Halfvarson, (unknown)	21
18	Validating microscopic colitis (MC) in Swedish pathology registers 2018 ·Scandinavian Journal of Gastroenterology ·Magnus Svensson, David Bergman, Ola Olén, Pär Myrelid, Johan Bohr, Anna Wickbom, Hamed Khalili, Andreas Münch, Jonas Halfvarson, Jonas F. Ludvigsson	33
19	Internet-Delivered Cognitive Behavioral Therapy for Children With Pain-Related Functional Gastrointestinal Disorders: Feasibility Study 2017 ·JMIR Mental Health ·Maria Lalouni, Brjánn Ljótsson, Marianne Bonnert, Erik Hedman‐Lagerlöf, Jens Högström, Eva Serlachius, Ola Olén	24
20	Association Between Long-term Oral Contraceptive Use and Risk of Crohn’s Disease Complications in a Nationwide Study 2016 ·Gastroenterology ·Hamed Khalili, Fredrik Granath, Karin E. Smedby, Anders Ekbom, Martin Neovius, Andrew T. Chan, Ola Olén	45

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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