Jan Nielsen

2.5k total citations
74 papers, 1.8k citations indexed

About

Jan Nielsen is a scholar working on Genetics, Public Health, Environmental and Occupational Health and Surgery. According to data from OpenAlex, Jan Nielsen has authored 74 papers receiving a total of 1.8k indexed citations (citations by other indexed papers that have themselves been cited), including 24 papers in Genetics, 23 papers in Public Health, Environmental and Occupational Health and 21 papers in Surgery. Recurrent topics in Jan Nielsen's work include Inflammatory Bowel Disease (23 papers), Pregnancy and Medication Impact (20 papers) and Microscopic Colitis (15 papers). Jan Nielsen is often cited by papers focused on Inflammatory Bowel Disease (23 papers), Pregnancy and Medication Impact (20 papers) and Microscopic Colitis (15 papers). Jan Nielsen collaborates with scholars based in Denmark, United States and Norway. Jan Nielsen's co-authors include Bente Mertz Nørgård, Jens Kjeldsen, Kirsten Ohm Kyvik, Torben Knudsen, René Fejer, Charlotte Leboeuf‐Yde, Jan Hartvigsen, Sonia Friedman, Line Riis Jølving and Niels Qvist and has published in prestigious journals such as American Journal of Clinical Nutrition, American Journal of Obstetrics and Gynecology and The American Journal of Gastroenterology.

In The Last Decade

Jan Nielsen

71 papers receiving 1.7k citations

Peers

Jan Nielsen

SURGE

GENET

PHEOH

EPIDE

IMMUN

Paola Saracco Italy

Roksana Karim United States

C Ribot France

Guy Grimard Canada

Kari Teramo Finland

Lisbeth Nilas Denmark

Nándor Ács Hungary

Behzat Özkan Türkiye

Philip J. Hashkes Israel

Manoel Joâo Batista Castello Girão Brazil

Paola Saracco Italy

Jan Nielsen

310 ×0.6

SURGE

220 ×0.5

GENET

283 ×0.6

PHEOH

210 ×0.6

EPIDE

387 ×1.1

IMMUN

Citations per year, relative to Jan Nielsen Jan Nielsen (= 1×) peers Paola Saracco

Countries citing papers authored by Jan Nielsen

Since Specialization

Citations

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

Fields of papers citing papers by Jan Nielsen

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Jan Nielsen

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

Friedman, Sonia, et al.. (2025). The Consequences of Preterm Birth in the Children of Mothers with Inflammatory Bowel Disease: A Nationwide Cohort Study. Inflammatory Bowel Diseases. 31(9). 2400–2407. 1 indexed citations

Nørgård, Bente Mertz, et al.. (2024). New Surgery and Hospital-diagnosed Infections in Elderly Patients with Inflammatory Bowel Disease Undergoing Surgery: A Nationwide Cohort Study. Journal of Crohn s and Colitis. 18(9). 1406–1414. 2 indexed citations

Jølving, Line Riis, Ken Lund, Mette Wod, et al.. (2024). Children and Adolescents Diagnosed With Inflammatory Bowel Disease Are at Increased Risk of Developing Diseases With a Possible Autoimmune Pathogenesis. Inflammatory Bowel Diseases. 31(1). 87–94. 3 indexed citations

Nørgård, Bente Mertz, et al.. (2023). COVID-19 Does Not Lead to an Increase in Corticosteroid Prescriptions in IBD Patients: A Nationwide Cohort Study. Inflammatory Bowel Diseases. 29(9). 1470–1476. 1 indexed citations

Friedman, Sonia, et al.. (2022). Paternal use of medications for inflammatory bowel disease and the risk of hospital‐diagnosed infections in the offspring: a nationwide cohort study. Alimentary Pharmacology & Therapeutics. 56(5). 823–830. 5 indexed citations

Nørgård, Bente Mertz, et al.. (2021). Post COVID-19 hospitalizations in patients with chronic inflammatory diseases – A nationwide cohort study. Journal of Autoimmunity. 125. 102739–102739. 6 indexed citations

Jølving, Line Riis, Jan Nielsen, Ulrik Schiøler Kesmodel, et al.. (2018). Chronic diseases in the children of women with maternal thyroid dysfunction: a nationwide cohort study. Clinical Epidemiology. Volume 10. 1381–1390. 12 indexed citations

Jølving, Line Riis, Jan Nielsen, Signe Sparre Beck‐Nielsen, et al.. (2017). The Association Between Maternal Chronic Inflammatory Bowel Disease and Long-term Health Outcomes in Children—A Nationwide Cohort Study. Inflammatory Bowel Diseases. 23(8). 1440–1446. 18 indexed citations

Nielsen, Jan, et al.. (2017). S-25-hydroxyvitamin D and C3-epimers in pregnancy and infancy: An Odense Child Cohort study. Clinical Biochemistry. 50(18). 988–996. 18 indexed citations

10.

Kjeldsen, Jens, et al.. (2017). Patients with inflammatory bowel disease have increased risk of autoimmune and inflammatory diseases. World Journal of Gastroenterology. 23(33). 6137–6146. 159 indexed citations

11.

Jølving, Line Riis, Jan Nielsen, Ulrik Schiøler Kesmodel, et al.. (2016). Prevalence of maternal chronic diseases during pregnancy – a nationwide population based study from 1989 to 2013. Acta Obstetricia Et Gynecologica Scandinavica. 95(11). 1295–1304. 83 indexed citations

12.

Hansen, Steinbjørn, Jan Nielsen, René Johannes Laursen, et al.. (2016). The Danish Neuro-Oncology Registry: establishment, completeness and validity. BMC Research Notes. 9(1). 425–425. 13 indexed citations

13.

Beck‐Nielsen, Signe Sparre, Grith Lykke Sørensen, Louise Bjørkholt Andersen, et al.. (2016). Vitamin D supplementation, cord 25-hydroxyvitamin D and birth weight: Findings from the Odense Child Cohort. Clinical Nutrition. 36(6). 1621–1627. 19 indexed citations

14.

Andersen, Louise Bjørkholt, Ralf Dechend, S. Ananth Karumanchi, et al.. (2016). Early pregnancy angiogenic markers and spontaneous abortion: an Odense Child Cohort study. American Journal of Obstetrics and Gynecology. 215(5). 594.e1–594.e11. 17 indexed citations

15.

Andersen, Louise Bjørkholt, Jan Stener Jørgensen, Tina Kold Jensen, et al.. (2015). Vitamin D insufficiency is associated with increased risk of first-trimester miscarriage in the Odense Child Cohort. American Journal of Clinical Nutrition. 102(3). 633–638. 80 indexed citations

16.

Andersen, Louise Bjørkholt, Ralf Dechend, Jan Stener Jørgensen, et al.. (2014). Diagnosis of preeclampsia with soluble Fms–like tyrosine kinase 1/placental growth factor ratio: an inter–assay comparison. Journal of the American Society of Hypertension. 9(2). 86–96. 36 indexed citations

17.

Hartvigsen, Jan, Jan Nielsen, Kirsten Ohm Kyvik, et al.. (2009). Heritability of spinal pain and consequences of spinal pain: A comprehensive genetic epidemiologic analysis using a population‐based sample of 15,328 twins ages 20–71 years. Arthritis Care & Research. 61(10). 1343–1351. 87 indexed citations

18.

Leboeuf‐Yde, Charlotte, Jan Nielsen, Kirsten Ohm Kyvik, René Fejer, & Jan Hartvigsen. (2009). Pain in the lumbar, thoracic or cervical regions: do age and gender matter? A population-based study of 34,902 Danish twins 20–71 years of age. BMC Musculoskeletal Disorders. 10(1). 39–39. 148 indexed citations

19.

Henryon, Mark, Per Soelberg Sørensen, Peter M. H. Heegaard, et al.. (2006). Limited evidence that baseline levels of immunological traits provide useful selection criteria for resistance to clinical and sub-clinical disease in pigs.. Proceedings of the 8th World Congress on Genetics Applied to Livestock Production, Belo Horizonte, Minas Gerais, Brazil, 13-18 August, 2006. 2 indexed citations

20.

Nielsen, Jan. (1996). Europa+2000: regionernes Europa. 48(1). 39. 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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