Amir Qamar

3.4k total citations · 2 hit papers
42 papers, 2.6k citations indexed

About

Amir Qamar is a scholar working on Hepatology, Epidemiology and Infectious Diseases. According to data from OpenAlex, Amir Qamar has authored 42 papers receiving a total of 2.6k indexed citations (citations by other indexed papers that have themselves been cited), including 15 papers in Hepatology, 12 papers in Epidemiology and 7 papers in Infectious Diseases. Recurrent topics in Amir Qamar's work include Liver Disease and Transplantation (10 papers), Liver Disease Diagnosis and Treatment (10 papers) and Organ Transplantation Techniques and Outcomes (5 papers). Amir Qamar is often cited by papers focused on Liver Disease and Transplantation (10 papers), Liver Disease Diagnosis and Treatment (10 papers) and Organ Transplantation Techniques and Outcomes (5 papers). Amir Qamar collaborates with scholars based in United States, United Kingdom and China. Amir Qamar's co-authors include Michel Warny, Ciarán P. Kelly, Lorraine Kyne, Norman D. Grace, Samer Aboudola, J. Thomas LaMont, Charalabos Pothoulakis, Simon Collinson, Pierre Michetti and Sonal Kumar and has published in prestigious journals such as New England Journal of Medicine, The Lancet and Journal of Clinical Investigation.

In The Last Decade

Amir Qamar

37 papers receiving 2.5k citations

Hit Papers

Asymptomatic Carriage ofClostridium difficileand Serum Le... 2000 2026 2008 2017 2000 2001 200 400 600
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.

  1. Asymptomatic Carriage ofClostridium difficileand Serum Levels of IgG Antibody against Toxin A
    2000 747 citations Lorraine Kyne, Michel Warny et al. New England Journal of Medicine profile →
  2. Association between antibody response to toxin A and protection against recurrent Clostridium difficile diarrhoea
    2001 621 citations Lorraine Kyne, Michel Warny et al. profile →

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Amir Qamar United States 16 1.6k 1.5k 501 437 293 42 2.6k
Marie‐France Mamzer France 35 581 0.4× 1.2k 0.8× 751 1.5× 540 1.2× 305 1.0× 133 3.9k
Zhi Chen China 28 225 0.1× 641 0.4× 376 0.8× 334 0.8× 726 2.5× 138 2.5k
Guilherme Macedo Portugal 30 384 0.2× 1.1k 0.7× 1.7k 3.3× 472 1.1× 301 1.0× 451 3.8k
Alissa Walsh United Kingdom 21 987 0.6× 1.7k 1.1× 881 1.8× 134 0.3× 1.2k 4.0× 66 3.4k
R. Gupta India 18 480 0.3× 460 0.3× 287 0.6× 270 0.6× 295 1.0× 94 1.7k
María Chaparro Spain 38 379 0.2× 2.7k 1.8× 1.5k 2.9× 358 0.8× 667 2.3× 251 5.4k
Anjana Pillai United States 18 167 0.1× 1.2k 0.8× 449 0.9× 1.3k 3.0× 398 1.4× 90 2.3k
Thierry Thévenot France 25 173 0.1× 2.0k 1.3× 520 1.0× 1.9k 4.4× 167 0.6× 101 3.0k
Robert Jones Australia 26 88 0.1× 408 0.3× 1.0k 2.1× 664 1.5× 278 0.9× 94 2.2k
Shōko Suzuki Japan 26 174 0.1× 418 0.3× 394 0.8× 320 0.7× 162 0.6× 99 1.7k

Countries citing papers authored by Amir Qamar

Since Specialization
Citations

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

Fields of papers citing papers by Amir Qamar

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Amir Qamar

This figure shows the co-authorship network connecting the top 25 collaborators of Amir Qamar. A scholar is included among the top collaborators of Amir Qamar 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 Amir Qamar. Amir Qamar 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.
Qamar, Amir, et al.. (2025). Risk mitigation, adaptability and sectoral resilience: Buffering in automotive supply chains prior & post disruption. Transportation Research Part E Logistics and Transportation Review. 201. 104263–104263.
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4.
Qamar, Amir & John Child. (2021). Grand Challenges within IB: Conducting Qualitative Research in the Covid Environment. AIB Insights. 21(3). 2 indexed citations
5.
6.
Qamar, Amir, Mark A. Hall, Daniel Chicksand, & Simon Collinson. (2019). Quality and flexibility performance trade-offs between lean and agile manufacturing firms in the automotive industry. Production Planning & Control. 31(9). 723–738. 40 indexed citations
7.
Chidlow, Agnieszka, et al.. (2019). The Changing Strategies of International Business. University of Birmingham Research Portal (University of Birmingham). 4 indexed citations
8.
Nugent, F. Warren, Amy E.B. Packard, K.U. Hunter, et al.. (2018). Economic analysis of transarterial chemoembolization (TACE) versus stereotactic body radiotherapy (SBRT) for the treatment of hepatocellular carcinoma (HCC).. Journal of Clinical Oncology. 36(4_suppl). 508–508. 4 indexed citations
9.
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Floch, Martin H., W. Allan Walker, Mary Ellen Sanders, et al.. (2015). Recommendations for Probiotic Use—2015 Update. Journal of Clinical Gastroenterology. 49(Supplement 1). S69–S73. 78 indexed citations
11.
Qamar, Amir. (2015). Probiotics in Nonalcoholic Fatty Liver Disease, Nonalcoholic Steatohepatitis, and Cirrhosis. Journal of Clinical Gastroenterology. 49(Supplement 1). S28–S32. 11 indexed citations
12.
Kumar, Sonal, Norman D. Grace, & Amir Qamar. (2014). Statin Use in Patients with Cirrhosis: A Retrospective Cohort Study. Digestive Diseases and Sciences. 59(8). 1958–1965. 76 indexed citations
13.
Qamar, Amir, Steven K. Burke, K Bland, et al.. (2012). The ability of serum from alpha 1‐antitrypsin–deficient patients to inhibit PRT‐201, a recombinant human type I pancreatic elastase. Biotechnology and Applied Biochemistry. 59(1). 22–28. 9 indexed citations
14.
Liu, Weitian, et al.. (2007). Fulminant Hepatic Failure Secondary to Erlotinib. Clinical Gastroenterology and Hepatology. 5(8). 917–920. 31 indexed citations
15.
Qamar, Amir, Shehzad Z. Sheikh, Ali J. Masud, et al.. (2006). In Vitro and In Vivo Protection of Stellate Cells from Apoptosis by Leptin. Digestive Diseases and Sciences. 51(10). 1697–1705. 30 indexed citations
16.
Kuniyasu, Yuhshi, et al.. (2005). Blocking intrahepatic deletion of activated CD8+ T cells by an altered peptide ligand. Cellular Immunology. 238(1). 31–37. 3 indexed citations
17.
Qamar, Amir, Samer Aboudola, Michel Warny, et al.. (2001). Saccharomyces boulardiiStimulates Intestinal Immunoglobulin A Immune Response toClostridium difficileToxin A in Mice. Infection and Immunity. 69(4). 2762–2765. 183 indexed citations
18.
Kyne, Lorraine, et al.. (2000). High anti-toxin a antibody levels are associated with protection against recurrent clostridium difficile diarrhea. Gastroenterology. 118(4). A885–A885. 4 indexed citations
19.
Kyne, Lorraine, Michel Warny, Amir Qamar, & Ciarán P. Kelly. (2000). Asymptomatic Carriage ofClostridium difficileand Serum Levels of IgG Antibody against Toxin A. New England Journal of Medicine. 342(6). 390–397. 747 indexed citations breakdown →
20.
Warny, Michel, Andrew C. Keates, Sarah Keates, et al.. (2000). p38 MAP kinase activation by Clostridium difficile toxin A mediates monocyte necrosis, IL-8 production, and enteritis. Journal of Clinical Investigation. 105(8). 1147–1156. 168 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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