Koji Otani

2.3k total citations
138 papers, 1.7k citations indexed

About

Koji Otani is a scholar working on Surgery, Gastroenterology and Pulmonary and Respiratory Medicine. According to data from OpenAlex, Koji Otani has authored 138 papers receiving a total of 1.7k indexed citations (citations by other indexed papers that have themselves been cited), including 82 papers in Surgery, 35 papers in Gastroenterology and 33 papers in Pulmonary and Respiratory Medicine. Recurrent topics in Koji Otani's work include Helicobacter pylori-related gastroenterology studies (30 papers), Eosinophilic Esophagitis (25 papers) and Inflammatory Bowel Disease (24 papers). Koji Otani is often cited by papers focused on Helicobacter pylori-related gastroenterology studies (30 papers), Eosinophilic Esophagitis (25 papers) and Inflammatory Bowel Disease (24 papers). Koji Otani collaborates with scholars based in Japan, United States and Hong Kong. Koji Otani's co-authors include Toshio Watanabe, Yasuhiro Fujiwara, Tetsuya Tanigawa, Yuji Nadatani, Fumio Tanaka, Hirokazu Yamagami, Yasuaki Nagami, Noriko Kamata, Shuhei Hosomi and Koichi Taira and has published in prestigious journals such as SHILAP Revista de lepidopterología, Gastroenterology and PLoS ONE.

In The Last Decade

Koji Otani

124 papers receiving 1.6k citations

Peers

Countries citing papers authored by Koji Otani

Since Specialization

Citations

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

Fields of papers citing papers by Koji Otani

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Koji Otani

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

#	Work	Indexed citations
1	Anti-integrin αvβ6 autoantibody in patients with ulcerative colitis after proctocolectomy: a cross-sectional study in Japan 2025 ·Intestinal Research ·(unknown), (unknown), Yumie Kobayashi, (unknown), Shuhei Hosomi, Hirotsugu Maruyama, Masaki Ominami, Yuji Nadatani, Shusei Fukunaga, Koji Otani, Fumio Tanaka, Yasuhiro Fujiwara	0
2	Prevalence of Belching Disorders and Their Characteristics in the General Adult Population 2024 ·The American Journal of Gastroenterology ·Yasuhiro Fujiwara, Akinari Sawada, Yumie Kobayashi, Shuhei Hosomi, Koji Otani, Shusei Fukunaga, Masaki Ominami, Koichi Taira, Fumio Tanaka	1
3	Evaluating the effects of 5‐aminosalicylic acid on tofacitinib treatment in ulcerative colitis 2024 ·Journal of Gastroenterology and Hepatology ·(unknown), Shuhei Hosomi, (unknown), Yumie Kobayashi, (unknown), Hirotsugu Maruyama, Masaki Ominami, Yuji Nadatani, Shusei Fukunaga, Koji Otani, Fumio Tanaka, (unknown)	5
4	Asia‐Pacific Survey on the Management of Helicobacter pylori Infection 2024 ·Journal of Gastroenterology and Hepatology ·Koji Otani, Hang Viet Dao, Rapat Pittayanon, Henry Liu, Kee Huat Chuah, John Hsiang, Ning Zhang, (unknown), Yasuhiro Fujiwara, (unknown)	2
5	Tuberculosis risk in patients with Crohn’s disease on biologics: a retrospective analysis of the Japanese Medical Claims Database 2024 ·Intestinal Research ·(unknown), Shuhei Hosomi, Yumie Kobayashi, (unknown), (unknown), Masaki Ominami, Yuji Nadatani, Shusei Fukunaga, Koji Otani, Fumio Tanaka, Satoko Ohfuji, Yasuhiro Fujiwara	2
6	Upper gastrointestinal endoscopic findings in functional constipation and irritable bowel syndrome diagnosed using the Rome IV criteria: a cross-sectional survey during a medical check-up in Japan 2023 ·BMC Gastroenterology ·Koji Otani, Toshio Watanabe, Kanae Takahashi, Yuji Nadatani, Masaki Ominami, Shusei Fukunaga, Shuhei Hosomi, Noriko Kamata, Fumio Tanaka, Yasuaki Nagami, Koichi Taira, Tatsuo Kimura, Shinya Fukumoto, Yasuhiro Fujiwara	0
7	Correlation between anxiety and decreased quality of life in patients with non‐esophageal eosinophilic gastrointestinal diseases 2023 ·JGH Open ·Fumio Tanaka, (unknown), Akinari Sawada, Masaki Ominami, Yuji Nadatani, Shusei Fukunaga, Koji Otani, Shuhei Hosomi, Noriko Kamata, Yasuaki Nagami, Koichi Taira, (unknown)	2
8	The impact of COVID‐19 on Japanese patients with eosinophilic gastrointestinal disorders during the vaccination era 2023 ·JGH Open ·(unknown), Akinari Sawada, Akihiro Higashimori, Rieko Nakata, (unknown), (unknown), Hirotsugu Maruyama, Masaki Ominami, Shusei Fukunaga, Koji Otani, Shuhei Hosomi, Noriko Kamata, Fumio Tanaka, Yasuaki Nagami, Koichi Taira	0
9	Clinical Implication of Preoperative C-Reactive Protein/Albumin Ratio in Malignant Transformation of Intraductal Papillary Mucinous Neoplasm: A Propensity Score Analysis 2022 ·Diagnostics ·Hirotsugu Maruyama, (unknown), (unknown), (unknown), (unknown), Masaki Ominami, Yuji Nadatani, Shusei Fukunaga, Koji Otani, Shuhei Hosomi, Fumio Tanaka, Noriko Kamata, Yasuaki Nagami, Koichi Taira, Go Ohira, Kenjiro Kimura, Ryosuke Amano, Yasuhiro Fujiwara	3
10	Esophageal mast cells may be associated with the perception of symptoms in patients with eosinophilic esophagitis 2022 ·Esophagus ·(unknown), Fumio Tanaka, (unknown), Akinari Sawada, Masaki Ominami, Yuji Nadatani, Shusei Fukunaga, Koji Otani, Shuhei Hosomi, Noriko Kamata, Yasuaki Nagami, Koichi Taira, Toshio Watanabe, Yasuhiro Fujiwara	13
11	Comparison of the Diagnostic Efficiency of Radial- and Convex-Arrayed Echoendoscopes for Indirect Findings of Pancreatic Cancer: A Retrospective Comparative Study Using Propensity Score Method 2021 ·Cancers ·(unknown), Hirotsugu Maruyama, Kei Yamamoto, (unknown), (unknown), (unknown), Masaki Ominami, Yuji Nadatani, Shusei Fukunaga, Koji Otani, Shuhei Hosomi, Fumio Tanaka, Noriko Kamata, Yasuaki Nagami, Koichi Taira, Masatsugu Shiba, Toshio Watanabe, Yasuhiro Fujiwara	1
12	Ovariectomy-Induced Dysbiosis May Have a Minor Effect on Bone in Mice 2021 ·Microorganisms ·(unknown), Yuji Nadatani, (unknown), Koji Otani, Kosuke Fujimoto, Yuki Nagata, Masaki Ominami, Shusei Fukunaga, Shuhei Hosomi, Noriko Kamata, Fumio Tanaka, Yasuaki Nagami, Koichi Taira, Seiya Imoto, Satoshi Uematsu, Toshio Watanabe, Yasuhiro Fujiwara	8
13	Novel prognostic biomarkers of pouchitis after ileal pouch-anal anastomosis for ulcerative colitis: Neutrophil-to-lymphocyte ratio 2020 ·PLoS ONE ·(unknown), Shuhei Hosomi, Hirokazu Yamagami, Koji Fujimoto, (unknown), (unknown), Yuji Nadatani, Shusei Fukunaga, Koji Otani, Fumio Tanaka, Yasuaki Nagami, Koichi Taira, Noriko Kamata, Toshio Watanabe, Yasuhito Iseki, Tatsunari Fukuoka, Masatsune Shibutani, Hisashi Nagahara, Satoko Ohfuji, Yasuhiro Fujiwara	12
14	Effects of Colchicine on NSAID-Induced Severe Small Intestinal Damage: A Pilot Study 2020 ·Digestion ·Koji Otani, Toshio Watanabe, Akihiro Higashimori, Yuji Nadatani, Yasuaki Nagami, Koichi Taira, Kentaro Inui, Yasuhiro Fujiwara	1
15	Gastric acid inhibitor aggravates indomethacin-induced small intestinal injury via reducing Lactobacillus johnsonii 2019 ·Scientific Reports ·Yuji Nadatani, Toshio Watanabe, Wataru Suda, (unknown), Yuji Matsumoto, (unknown), Akihiro Higashimori, Koji Otani, Shuhei Hosomi, Fumio Tanaka, Yasuaki Nagami, Noriko Kamata, Koichi Taira, Hirokazu Yamagami, Tetsuya Tanigawa, Masahira Hattori, Yasuhiro Fujiwara	41
16	Optimal Biopsy Protocol to Evaluate Histological Effectiveness of Proton Pump Inhibitor Therapy in Patients with Eosinophilic Esophagitis 2018 ·Digestion ·Yasuhiro Fujiwara, Atsushi Hashimoto, (unknown), Akinari Sawada, Koji Otani, Fumio Tanaka, Hirokazu Yamagami, Tetsuya Tanigawa, Toshio Watanabe, Daijiro Kabata, Yuko Kuwae, Ayumi Shintani, Masahiko Ohsawa	15
17	Usefulness of small bowel reexamination in obscure gastrointestinal bleeding patients with negative capsule endoscopy findings: Comparison of repeat capsule endoscopy and double‐balloon enteroscopy 2018 ·United European Gastroenterology Journal ·Koji Otani, Toshio Watanabe, Sunao Shimada, Yuji Nadatani, Shuhei Hosomi, Yasuaki Nagami, Fumio Tanaka, Noriko Kamata, Koichi Taira, Hirokazu Yamagami, Tetsuya Tanigawa, Masatsugu Shiba, Yasuhiro Fujiwara	9
18	NLRP3 inflammasome has a protective effect against oxazolone-induced colitis: a possible role in ulcerative colitis 2016 ·Scientific Reports ·(unknown), Toshio Watanabe, Yuji Nadatani, Naoki Sugimura, Sunao Shimada, Shogo Takeda, Koji Otani, Shuhei Hosomi, Yasuaki Nagami, Fumio Tanaka, Noriko Kamata, Hirokazu Yamagami, Tetsuya Tanigawa, Masatsugu Shiba, Kazunari Tominaga, Yasuhiro Fujiwara, Tetsuo Arakawa	79
19	Rebamipide inhibits indomethacin-induced small intestinal injury: Possible involvement of intestinal microbiota modulation by upregulation of α-defensin 5 2013 ·European Journal of Pharmacology ·Tetsuya Tanigawa, Toshio Watanabe, Koji Otani, Yuji Nadatani, (unknown), Mitsue Sogawa, Hirokazu Yamagami, Masatsugu Shiba, Kenji Watanabe, Kazunari Tominaga, Yasuhiro Fujiwara, Koji Takeuchi, Tetsuo Arakawa	46
20	Chronic Neutrophilic Leukemia Associated with Monoclonal Gammopathy of Undetermined Significance 1996 ·Acta Haematologica ·Takayoshi Ito, (unknown), Koji Otani, Takuya Komeno, Shoichi Mitsuhashi, Yuichi Hasegawa, (unknown), Haruhiko Ninomiya, Toshiro Nagasawa, Tsukasa Abe	20

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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