Christopher Ma

8.8k total citations · 3 hit papers
272 papers, 4.9k citations indexed

About

Christopher Ma is a scholar working on Genetics, Epidemiology and Surgery. According to data from OpenAlex, Christopher Ma has authored 272 papers receiving a total of 4.9k indexed citations (citations by other indexed papers that have themselves been cited), including 183 papers in Genetics, 145 papers in Epidemiology and 89 papers in Surgery. Recurrent topics in Christopher Ma's work include Inflammatory Bowel Disease (183 papers), Microscopic Colitis (123 papers) and Eosinophilic Esophagitis (45 papers). Christopher Ma is often cited by papers focused on Inflammatory Bowel Disease (183 papers), Microscopic Colitis (123 papers) and Eosinophilic Esophagitis (45 papers). Christopher Ma collaborates with scholars based in Canada, United States and Italy. Christopher Ma's co-authors include Brian G. Feagan, Remo Panaccione, Vipul Jairath, Vipul Jairath, Siddharth Singh, William J. Sandborn, Zhong Lin Wang, Claire E. Parker, Gilaad G. Kaplan and Daniel Moore and has published in prestigious journals such as New England Journal of Medicine, Journal of the American Chemical Society and SHILAP Revista de lepidopterología.

In The Last Decade

Christopher Ma

252 papers receiving 4.8k 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.

Assessment of Crohn’s disease-associated small bowel strictures and fibrosis on cross-sectional imaging: a systematic review

2019 212 citations Dominik Bettenworth, Arne Bokemeyer et al. Gut profile →
Comparative efficacy and safety of biologic therapies for moderate-to-severe Crohn's disease: a systematic review and network meta-analysis

2021 174 citations Siddharth Singh, Rocío Sedaño et al. profile →
Artificial intelligence to revolutionize IBD clinical trials: a comprehensive review

2025 21 citations Rocío Sedaño, Virginia Solitano et al. Therapeutic Advances in Gastroenterology profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Christopher Ma Canada	36	3.0k	2.4k	1.6k	786	449	272	4.9k
Nanne K.H. de Boer Netherlands	40	2.1k 0.7×	1.6k 0.7×	998 0.6×	640 0.8×	369 0.8×	290	5.6k
David A. Schwartz United States	57	2.6k 0.9×	1.7k 0.7×	4.5k 2.8×	462 0.6×	1.7k 3.9×	328	10.7k
R Mark Beattie United Kingdom	35	1.9k 0.6×	1.3k 0.5×	1.4k 0.9×	389 0.5×	176 0.4×	202	4.2k
A. Osama Gaber United States	49	697 0.2×	1.1k 0.5×	4.3k 2.7×	854 1.1×	1.5k 3.4×	366	8.9k
Amit Agrawal United Kingdom	41	316 0.1×	693 0.3×	2.3k 1.4×	89 0.1×	741 1.7×	149	6.0k
Chin‐Li Lu Taiwan	31	232 0.1×	441 0.2×	716 0.5×	142 0.2×	617 1.4×	157	3.3k
Michael B. Kimmey United States	44	623 0.2×	746 0.3×	4.0k 2.6×	63 0.1×	2.0k 4.5×	126	7.3k
Leslie T. Cooper United States	59	263 0.1×	2.4k 1.0×	4.7k 3.0×	1.1k 1.4×	919 2.0×	219	18.9k
R. Williams United Kingdom	39	375 0.1×	2.6k 1.1×	923 0.6×	354 0.5×	408 0.9×	149	5.0k
Gionata Fiorino Italy	48	4.5k 1.5×	3.3k 1.4×	1.9k 1.2×	1.9k 2.4×	698 1.6×	255	7.0k

Countries citing papers authored by Christopher Ma

Since Specialization

Citations

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

Fields of papers citing papers by Christopher Ma

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Christopher Ma

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

Hirano, Ikuo, Glenn T. Furuta, Gary W. Falk, et al.. (2025). Review article: Seeing Is Believing–The Eosinophilic Oesophagitis Endoscopic Reference Score Can Serve as a Valuable Clinical Trial Endpoint in Eosinophilic Oesophagitis. Alimentary Pharmacology & Therapeutics. 63(3). 341–351.

Goodsall, Thomas M, Claire E. Parker, Alice S. Day, et al.. (2025). Editorial: Intestinal Ultrasound for the Assessment of Constipation—Out of the Shadows? Authors' Reply. Alimentary Pharmacology & Therapeutics. 62(8). 855–856.

Stukalin, Igor, et al.. (2025). Refractory Immune Checkpoint Inhibitor Colitis Treated With Biologics, Janus Kinase Inhibition, Plasma Exchange, and Fecal Microbiota Transplantation. ACG Case Reports Journal. 12(10). e01847–e01847.

Yuan, Yuhong, Neeraj Narula, Christopher Ma, et al.. (2025). Meta‐Analysis: Improvement of Bowel Urgency With Advanced Therapies for Inflammatory Bowel Disease. Alimentary Pharmacology & Therapeutics. 63(4). 452–467. 1 indexed citations

Sedaño, Rocío, Virginia Solitano, Sudheer K. Vuyyuru, et al.. (2025). Artificial intelligence to revolutionize IBD clinical trials: a comprehensive review. Therapeutic Advances in Gastroenterology. 18. 1128504891–1128504891. 21 indexed citations breakdown →

Solitano, Virginia, Çharles N. Bernstein, Iris Dotan, et al.. (2025). Shaping the future of inflammatory bowel disease: a global research agenda for better management and public health response. Nature Reviews Gastroenterology & Hepatology. 22(6). 438–452. 5 indexed citations

Reinisch, Walter, Gil Melmed, Hiroshi Nakase, et al.. (2024). Comparative Efficacy and Safety of Upadacitinib vs. Vedolizumab, Ustekinumab, and Tofacitinib After Induction and Maintenance for Ulcerative Colitis: Three Matching-Adjusted Indirect Comparisons. Advances in Therapy. 41(10). 3832–3849. 1 indexed citations

Chu, Matthew, Suzanne Edwards, Alice S. Day, et al.. (2024). Meta‐analysis: Intestinal ultrasound to evaluate colonic contents and constipation. Alimentary Pharmacology & Therapeutics. 60(1). 6–16. 3 indexed citations

Colman, Ruben J., Virginia Solitano, John K MacDonald, et al.. (2024). Operating Properties of Disease Activity Indices in Pediatric Inflammatory Bowel Disease: A Systematic Review. Inflammatory Bowel Diseases. 31(1). 220–245. 1 indexed citations

10.

Sands, Bruce E., Laurent Peyrin‐Biroulet, Silvio Danese, et al.. (2023). 477a A PHASE 2, RANDOMIZED, DOUBLE-BLIND, PLACEBO-CONTROLLED TRIAL OF PRA023 AS INDUCTION THERAPY IN PATIENTS WITH MODERATELY TO SEVERELY ACTIVE ULCERATIVE COLITIS: ARTEMISUC, COHORT 1. Gastroenterology. 164(6). S–1570. 1 indexed citations

11.

Co, Michael, et al.. (2023). Clinical Outcomes of Conservative Treatment for Low-Risk Ductal Carcinoma in Situ: A Systematic Review and Pooled Analysis. Clinical Oncology. 35(4). 255–261. 1 indexed citations

12.

Parker, Claire E., John K MacDonald, Joshua Chang, et al.. (2023). Use of external control arms in immune-mediated inflammatory diseases: a systematic review. BMJ Open. 13(12). e076677–e076677. 5 indexed citations

13.

Vuyyuru, Sudheer K., Virginia Solitano, Neeraj Narula, et al.. (2023). Pharmacological Therapies for the Management of Fistulizing Crohn’s Disease: A Systematic Review and Meta-Analysis. Journal of Crohn s and Colitis. 18(4). 589–603. 11 indexed citations

14.

Vuyyuru, Sudheer K., Virginia Solitano, Siddharth Singh, et al.. (2023). Scoring Indices for Perianal Fistulising Crohn’s Disease: A Systematic Review. Journal of Crohn s and Colitis. 18(6). 836–850. 10 indexed citations

15.

Hamilton, Patrick, Katherine A Buhler, John K MacDonald, et al.. (2023). Meta‐analysis: Placebo rates in microscopic colitis randomised trials and applications for future drug development using a historical control arm. Alimentary Pharmacology & Therapeutics. 57(8). 837–850. 1 indexed citations

16.

Ma, Christopher, Rocío Sedaño, Jurij Hanžel, et al.. (2022). Placebo Response Rates in Randomized Controlled Trials for Perianal Crohn’s Disease: A Systematic Review and Meta-Analysis. Journal of Crohn s and Colitis. 17(4). 644–658. 2 indexed citations

17.

Hanžel, Jurij, Alexandra C. Istl, Claire E. Parker, et al.. (2021). Increased Risk of Infections with Anti-TNF Agents in Patients with Crohn’s Disease After Elective Surgery: Meta-Analysis. Digestive Diseases and Sciences. 67(2). 646–660. 5 indexed citations

18.

Tsai, Lester, Jeffrey D. McCurdy, Christopher Ma, Vipul Jairath, & Siddharth Singh. (2021). Epidemiology and Natural History of Perianal Crohn’s Disease: A Systematic Review and Meta-Analysis of Population-Based Cohorts. Inflammatory Bowel Diseases. 28(10). 1477–1484. 65 indexed citations

19.

Bettenworth, Dominik, Arne Bokemeyer, Mark E. Baker, et al.. (2019). Assessment of Crohn’s disease-associated small bowel strictures and fibrosis on cross-sectional imaging: a systematic review. Gut. 68(6). 1115–1126. 212 indexed citations breakdown →

20.

Ma, Christopher, Richard N. Fedorak, Gilaad G. Kaplan, et al.. (2017). Clinical, endoscopic and radiographic outcomes with ustekinumab in medically‐refractory Crohn's disease: real world experience from a multicentre cohort. Alimentary Pharmacology & Therapeutics. 45(9). 1232–1243. 123 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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