Nielsen Am

1.0k total citations
43 papers, 726 citations indexed

About

Nielsen Am is a scholar working on Epidemiology, Surgery and Genetics. According to data from OpenAlex, Nielsen Am has authored 43 papers receiving a total of 726 indexed citations (citations by other indexed papers that have themselves been cited), including 15 papers in Epidemiology, 14 papers in Surgery and 12 papers in Genetics. Recurrent topics in Nielsen Am's work include Microscopic Colitis (12 papers), Inflammatory Bowel Disease (11 papers) and Helicobacter pylori-related gastroenterology studies (10 papers). Nielsen Am is often cited by papers focused on Microscopic Colitis (12 papers), Inflammatory Bowel Disease (11 papers) and Helicobacter pylori-related gastroenterology studies (10 papers). Nielsen Am collaborates with scholars based in Denmark, Netherlands and United Kingdom. Nielsen Am's co-authors include Klaus Theede, Inge Nordgaard-Lassen, Per Ibsen, Klaus Bukhave, J Rask-Madsen, Marianne Kiszka‐Kanowitz, Steen Ladelund, Susanne Holck, Jens Hillingsø and J Clemmesen and has published in prestigious journals such as Gastroenterology, Gut and British Journal of Cancer.

In The Last Decade

Nielsen Am

41 papers receiving 688 citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Nielsen Am Denmark 13 331 317 278 150 93 43 726
K Teahon United Kingdom 18 408 1.2× 447 1.4× 361 1.3× 138 0.9× 100 1.1× 25 924
Giorgio Assuero Lanfranchi Italy 16 372 1.1× 673 2.1× 553 2.0× 197 1.3× 75 0.8× 28 1.1k
F Bárány Sweden 11 295 0.9× 462 1.5× 399 1.4× 73 0.5× 55 0.6× 19 731
A. B. Hawthorne United Kingdom 14 440 1.3× 600 1.9× 435 1.6× 127 0.8× 39 0.4× 26 1.1k
Richard Gillies Canada 7 322 1.0× 756 2.4× 618 2.2× 111 0.7× 49 0.5× 11 1.1k
S. G. Flavell Matts United Kingdom 11 177 0.5× 292 0.9× 287 1.0× 70 0.5× 53 0.6× 47 600
Ben Novis Israel 18 419 1.3× 139 0.4× 156 0.6× 169 1.1× 53 0.6× 52 862
Aytan Miranda Sipahi Brazil 16 240 0.7× 158 0.5× 244 0.9× 118 0.8× 61 0.7× 60 629
Pauline Rivière France 16 325 1.0× 426 1.3× 304 1.1× 92 0.6× 78 0.8× 47 786
C N Bernstein Canada 11 211 0.6× 308 1.0× 229 0.8× 91 0.6× 39 0.4× 33 587

Countries citing papers authored by Nielsen Am

Since Specialization
Citations

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

Fields of papers citing papers by Nielsen Am

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Nielsen Am

This figure shows the co-authorship network connecting the top 25 collaborators of Nielsen Am. A scholar is included among the top collaborators of Nielsen Am 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 Nielsen Am. Nielsen Am is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Am, Nielsen, Klaus Theede, Lise Lotte Gluud, & Marianne Kiszka‐Kanowitz. (2024). Efficacy of optimised thiopurine therapy in patients with moderate-to-severe ulcerative colitis: retrospective long-term follow-up from two randomised trials. Scandinavian Journal of Gastroenterology. 59(6). 669–673. 1 indexed citations
2.
Kiszka‐Kanowitz, Marianne, Klaus Theede, Jacob Tveiten Bjerrum, et al.. (2022). Low-dose azathioprine and allopurinol versus azathioprine monotherapy in patients with ulcerative colitis (AAUC): An investigator-initiated, open, multicenter, parallel-arm, randomised controlled trial. EClinicalMedicine. 45. 101332–101332. 17 indexed citations
3.
Allin, Kristine H., Johan Burisch, Camilla Bjørn Jensen, et al.. (2019). Outcome of concomitant treatment with thiopurines and allopurinol in patients with inflammatory bowel disease: A nationwide Danish cohort study. United European Gastroenterology Journal. 8(1). 68–76. 14 indexed citations
4.
Kiszka‐Kanowitz, Marianne, et al.. (2018). Optimized thiopurine therapy before withdrawal of anti-tumour necrosis factor-α in patients with Crohn’s disease. European Journal of Gastroenterology & Hepatology. 30(10). 1155–1158. 2 indexed citations
5.
Theede, Klaus, et al.. (2016). Fecal Calprotectin Predicts Relapse and Histological Mucosal Healing in Ulcerative Colitis. Inflammatory Bowel Diseases. 22(5). 1042–1048. 107 indexed citations
6.
Theede, Klaus, Susanne Holck, Per Ibsen, et al.. (2015). Level of Fecal Calprotectin Correlates With Endoscopic and Histologic Inflammation and Identifies Patients With Mucosal Healing in Ulcerative Colitis. Clinical Gastroenterology and Hepatology. 13(11). 1929–1936.e1. 132 indexed citations
7.
Theede, Klaus, Marianne Kiszka‐Kanowitz, Inge Nordgaard-Lassen, & Nielsen Am. (2015). The Impact of Endoscopic Inflammation and Mucosal Healing on Health-related Quality of Life in Ulcerative Colitis Patients. Journal of Crohn s and Colitis. 9(8). 625–632. 30 indexed citations
8.
Kiszka‐Kanowitz, Marianne, Klaus Theede, & Nielsen Am. (2014). Optimering af thiopurinbehandling ved kronisk inflammatorisk tarmsygdom. Ugeskrift for Læger. 176(22). 2–5. 1 indexed citations
9.
Am, Nielsen, Jens Hillingsø, Klaus Bukhave, & J Rask-Madsen. (1996). Omeprazole promotes proximal duodenal mucosal bicarbonate secretion in humans.. Gut. 38(1). 6–10. 12 indexed citations
10.
Am, Nielsen, Jens Hillingsø, Hanne Frøkiær, Klaus Bukhave, & J Rask-Madsen. (1996). Gastric Bicarbonate Secretion and Release of Prostaglandin E2Are Increased in Duodenal Ulcer Patients But Not inHelicobacter pylori-Positive Healthy Subjects. Scandinavian Journal of Gastroenterology. 31(1). 38–43. 65 indexed citations
11.
Højgaard, Liselotte, Nielsen Am, & S. J. Rune. (1996). Peptic Ulcer Pathophysiology: Acid, Bicarbonate, and Mucosal Function. Scandinavian Journal of Gastroenterology. 31(sup216). 10–15. 39 indexed citations
12.
13.
Am, Nielsen, Jens Hillingsø, Klaus Bukhave, & J Rask-Madsen. (1995). Indomethacin Decreases Gastroduodenal Mucosal Bicarbonate Secretion in Humans. Scandinavian Journal of Gastroenterology. 30(12). 1160–1165. 10 indexed citations
14.
Am, Nielsen, Lars Kristian Munck, Klaus Bukhave, & J Rask-Madsen. (1989). Muscarinic M1-receptors regulate gastric mucosal prostaglandin E2 formation. European Journal of Gastroenterology & Hepatology. 1(1). 57–62. 4 indexed citations
15.
Munck, Lars Kristian, Nielsen Am, Henrik Westh, et al.. (1988). Prostaglandin E2 is a mediator of 5-hydroxytryptamine induced water and electrolyte secretion in the human jejunum.. Gut. 29(10). 1337–1341. 37 indexed citations
16.
Olesen, Thomas Bastholm, M Egeblad, H Dige‐Petersen, et al.. (1988). Somatic Manifestations in Children Suspected of Having Been Maltreated. Acta Paediatrica. 77(1). 154–160. 7 indexed citations
17.
Clemmesen, J & Nielsen Am. (1957). Cancer incidence in Denmark 1943 to 1953. IV. Distribution according to habitation categories.. PubMed. 4(2). 55–72. 1 indexed citations
18.
Clemmesen, J & Nielsen Am. (1956). Cancer incidence in Denmark 1943 to 1953. I. Population at risk.. PubMed. 3(2). 33–5. 2 indexed citations
19.
Am, Nielsen, et al.. (1956). Cancer incidence in Denmark 1943 to 1953. III. Number of cases in whole country.. PubMed. 3(8). 249–53. 4 indexed citations
20.
Clemmesen, J, Nielsen Am, & E. Jensen. (1953). Mortality and incidence of cancer of the lung in Denmark and some other countries.. PubMed. 9(3). 603–36. 20 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.

Explore authors with similar magnitude of impact

Breakdown of academic impact, for papers by K Teahon Breakdown of academic impact, for papers by Giorgio Assuero Lanfranchi Breakdown of academic impact, for papers by F Bárány Breakdown of academic impact, for papers by A. B. Hawthorne Breakdown of academic impact, for papers by Richard Gillies Breakdown of academic impact, for papers by S. G. Flavell Matts Breakdown of academic impact, for papers by Ben Novis Breakdown of academic impact, for papers by Aytan Miranda Sipahi Breakdown of academic impact, for papers by Pauline Rivière Breakdown of academic impact, for papers by C N Bernstein
Rankless by CCL
2026