Koji Sumii

27 total papers · 869 total citations
24 papers, 734 citations indexed

About

Koji Sumii is a scholar working on Surgery, Pulmonary and Respiratory Medicine and Gastroenterology. According to data from OpenAlex, Koji Sumii has authored 24 papers receiving a total of 734 indexed citations (citations by other indexed papers that have themselves been cited), including 17 papers in Surgery, 9 papers in Pulmonary and Respiratory Medicine and 6 papers in Gastroenterology. Recurrent topics in Koji Sumii's work include Helicobacter pylori-related gastroenterology studies (13 papers), Gastric Cancer Management and Outcomes (8 papers) and Eosinophilic Esophagitis (7 papers). Koji Sumii is often cited by papers focused on Helicobacter pylori-related gastroenterology studies (13 papers), Gastric Cancer Management and Outcomes (8 papers) and Eosinophilic Esophagitis (7 papers). Koji Sumii collaborates with scholars based in Japan and Australia. Koji Sumii's co-authors include Ken Haruma, Goro Kajiyama, Ken Haruma, Goro Kajiyama, Masaharu Yoshihara, Shinji Tanaka, Fumio Shimamoto, Tomoari Kamada, Kunihiko Komoto and Mitsuhiro Mihara and has published in prestigious journals such as Gastroenterology, The American Journal of Gastroenterology and Diseases of the Colon & Rectum.

In The Last Decade

Koji Sumii

24 papers receiving 715 citations

Author Peers

Peers are selected by citation overlap in the author's most active subfields. citations · hero ref

Author Last Decade Papers Cites
Koji Sumii 467 334 191 189 135 24 734
T Nagayo 450 1.0× 320 1.0× 112 0.6× 113 0.6× 140 1.0× 15 675
Takahisa Nakayama 445 1.0× 142 0.4× 265 1.4× 78 0.4× 119 0.9× 29 631
Andrea Rajnakova 540 1.2× 396 1.2× 191 1.0× 137 0.7× 219 1.6× 21 907
P. W. N. Keeling 593 1.3× 125 0.4× 75 0.4× 212 1.1× 115 0.9× 20 760
Shinichiro Zushi 280 0.6× 229 0.7× 185 1.0× 130 0.7× 211 1.6× 20 859
Flavio Valiante 515 1.1× 464 1.4× 248 1.3× 208 1.1× 42 0.3× 30 765
Yasushi Nakane 392 0.8× 464 1.4× 178 0.9× 172 0.9× 160 1.2× 37 822
Tsukasa Kotoh 402 0.9× 472 1.4× 206 1.1× 105 0.6× 144 1.1× 24 757
Pierre Lao-Sirieix 508 1.1× 255 0.8× 156 0.8× 74 0.4× 279 2.1× 19 820
Kotaro Hirashima 296 0.6× 269 0.8× 234 1.2× 38 0.2× 191 1.4× 28 640

Countries citing papers authored by Koji Sumii

Since Specialization
Citations

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

Fields of papers citing papers by Koji Sumii

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Koji Sumii

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

All Works

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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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2026