Keiko Niimi

2.9k total citations
79 papers, 2.0k citations indexed

About

Keiko Niimi is a scholar working on Pulmonary and Respiratory Medicine, Surgery and Gastroenterology. According to data from OpenAlex, Keiko Niimi has authored 79 papers receiving a total of 2.0k indexed citations (citations by other indexed papers that have themselves been cited), including 54 papers in Pulmonary and Respiratory Medicine, 42 papers in Surgery and 32 papers in Gastroenterology. Recurrent topics in Keiko Niimi's work include Gastric Cancer Management and Outcomes (51 papers), Gastrointestinal Tumor Research and Treatment (24 papers) and Metastasis and carcinoma case studies (20 papers). Keiko Niimi is often cited by papers focused on Gastric Cancer Management and Outcomes (51 papers), Gastrointestinal Tumor Research and Treatment (24 papers) and Metastasis and carcinoma case studies (20 papers). Keiko Niimi collaborates with scholars based in Japan, United States and Italy. Keiko Niimi's co-authors include Mitsuhiro Fujishiro, Nobutake Yamamichi, Shinya Kodashima, Satoshi Ono, Kazuhiko Koike, Osamu Goto, Masao Omata, Chihiro Minatsuki, Yosuke Tsuji and Yoshiki Sakaguchi and has published in prestigious journals such as SHILAP Revista de lepidopterología, Blood and Gastroenterology.

In The Last Decade

Keiko Niimi

75 papers receiving 2.0k citations

Peers

Countries citing papers authored by Keiko Niimi

Since Specialization

Citations

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

Fields of papers citing papers by Keiko Niimi

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Keiko Niimi

This figure shows the co-authorship network connecting the top 25 collaborators of Keiko Niimi. A scholar is included among the top collaborators of Keiko Niimi 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 Keiko Niimi. Keiko Niimi 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	Short sleep duration is a significant risk factor of obesity: A multicenter observational study of healthy adults in Japan 2025 ·PLoS ONE ·Mami Takahashi, Takeshi Shimamoto, Lumine Matsumoto, (unknown), Yukari Masuda, Hirotaka Matsuzaki, Eriko Hasumi, (unknown), Keiko Niimi, Takako Nishikawa, Ryoichi Wada, Nobutake Yamamichi	0
2	Marked intestinal trans-differentiation by autoimmune gastritis along with ectopic pancreatic and pulmonary trans-differentiation 2023 ·Journal of Gastroenterology ·Chihiro Takeuchi, Junichi Sato, Nobutake Yamamichi, Natsuko Kageyama‐Yahara, Akiko Sasaki, Takemi Akahane, Rika Aoki, Shigemi Nakajima, Masayoshi Ito, (unknown), Yuyu Liu, (unknown), Yu Takahashi, Yoshiki Sakaguchi, Yosuke Tsuji, Kouhei Sakurai, Shuta Tomida, Keiko Niimi, Toshikazu Ushijima, Mitsuhiro Fujishiro	2
3	Performing the ABC Method Twice for Gastric Cancer Risk Stratification: A Retrospective Study Based on Data from a Large-Scale Screening Facility 2023 ·Diagnostics ·(unknown), Yu Takahashi, Takeshi Shimamoto, (unknown), (unknown), (unknown), (unknown), (unknown), (unknown), Yoshiki Sakaguchi, Seiichi Yakabi, Keiko Niimi, Naomi Kakushima, Yosuke Tsuji, Ryoichi Wada, Nobutake Yamamichi, Mitsuhiro Fujishiro	1
4	Risk factors for incomplete resection with pharyngeal endoscopic submucosal dissection and long-term prognosis after resection 2023 ·Surgical Endoscopy ·Yoshiki Sakaguchi, Yuki Saito, Mizuo Ando, Masafumi Yoshida, Osamu Fukuoka, Kenya Kobayashi, (unknown), (unknown), (unknown), Keiko Niimi, Yosuke Tsuji, Mitsuhiro Fujishiro, Tatsuya Yamasoba	4
5	Analysis of Barrett’s Esophagus and Its Risk Factors: A Cross-Sectional Study of 10,122 Subjects at a Japanese Health Examination Center 2022 ·Digestion ·(unknown), Yu Takahashi, Nobutake Yamamichi, (unknown), Takeshi Shimamoto, Chihiro Minatsuki, (unknown), (unknown), Yosuke Tsuji, Yoshiki Sakaguchi, Naoki Tamura, Seiichi Yakabi, (unknown), (unknown), Keiko Niimi, Ryoichi Wada, Mitsuhiro Fujishiro	7
6	胃癌の浸潤深さを予測するための高精度人工知能システム:従来の白色光イメージング,非拡大狭帯域イメージングおよびインジゴカルミン色素コントラストイメージングの有効性【JST・京大機械翻訳】 2020 ·Gastrointestinal Endoscopy ·(unknown), Yosuke Tsuji, Yoshiki Sakaguchi, (unknown), Chihiro Minatsuki, Keiko Niimi, (unknown), Nobutake Yamamichi, Yasuyuki Seto, Tomohiro Tada, Kazuhiko Koike	4
7	Steroid injection and polyglycolic acid shielding to prevent stricture after esophageal endoscopic submucosal dissection: a retrospective comparative analysis (with video) 2020 ·Gastrointestinal Endoscopy ·Yoshiki Sakaguchi, Yosuke Tsuji, Tomohiro Shinozaki, (unknown), (unknown), Chihiro Minatsuki, Keiko Niimi, Nobutake Yamamichi, Kazuhiko Koike	19
8	Expression of Gastric Markers Is Associated with Malignant Potential of Nonampullary Duodenal Adenocarcinoma 2018 ·Digestive Diseases and Sciences ·Chihiro Minatsuki, Nobutake Yamamichi, Ken-ichi Inada, Yu Takahashi, Kouhei Sakurai, Takeshi Shimamoto, Yosuke Tsuji, Kazuya Shiogama, Shinya Kodashima, Yoshiki Sakaguchi, Keiko Niimi, Satoshi Ono, Toru Niwa, Ken Ohata, Nobuyuki Matsuhashi, Masao Ichinose, Mitsuhiro Fujishiro, Yutaka Tsutsumi, Kazuhiko Koike	11
9	Laparoscopic and endoscopic cooperative surgery for gastrointestinal tumor 2017 ·Annals of Translational Medicine ·Keiko Niimi, Rei Ishibashi, Takashi Mitsui, Susumu Aikou, Shinya Kodashima, Hiroharu Yamashita, Nobutake Yamamichi, Yoshihiro Hirata, Mitsuhiro Fujishiro, Yasuyuki Seto, Kazuhiko Koike	19
10	Novel Technique for Full-Thickness Resection of Gastric Malignancy 2013 ·Surgical Laparoscopy Endoscopy & Percutaneous Techniques ·Takashi Mitsui, Osamu Goto, Nobuyuki Shimizu, Fumihiko Hatao, Ikuo Wada, Keiko Niimi, Itsuko Asada‐Hirayama, Mitsuhiro Fujishiro, Kazuhiko Koike, Yasuyuki Seto	34
11	Helicobacter pylori infection is positively associated with gallstones: a large-scale cross-sectional study in Japan 2013 ·Journal of Gastroenterology ·Yu Takahashi, Nobutake Yamamichi, Takeshi Shimamoto, Satoshi Mochizuki, Mitsuhiro Fujishiro, Chihiro Takeuchi, Yoshiki Sakaguchi, Keiko Niimi, Satoshi Ono, Shinya Kodashima, Toru Mitsushima, Kazuhiko Koike	32
12	Background Factors of Reflux Esophagitis and Non-Erosive Reflux Disease: A Cross-Sectional Study of 10,837 Subjects in Japan 2013 ·PLoS ONE ·Chihiro Minatsuki, Nobutake Yamamichi, Takeshi Shimamoto, (unknown), Yu Takahashi, Mitsuhiro Fujishiro, Yoshiki Sakaguchi, Chiemi Nakayama, Maki Konno‐Shimizu, Rie Matsuda, Satoshi Mochizuki, Itsuko Asada‐Hirayama, Yosuke Tsuji, Shinya Kodashima, Satoshi Ono, Keiko Niimi, Toru Mitsushima, Kazuhiko Koike	67
13	Evaluation of safety of endoscopic biopsy without cessation of antithrombotic agents in Japan 2012 ·Journal of Gastroenterology ·Satoshi Ono, Mitsuhiro Fujishiro, Shinya Kodashima, Yu Takahashi, Chihiro Minatsuki, (unknown), Itsuko Asada‐Hirayama, Maki Konno‐Shimizu, Yosuke Tsuji, Satoshi Mochizuki, Keiko Niimi, Nobutake Yamamichi, Makoto Kaneko, Yutaka Yatomi, Kazuhiko Koike	37
14	Endoscopic mucosal resection with a ligation device or endoscopic submucosal dissection for rectal carcinoid tumors: An analysis of 24 consecutive cases 2012 ·Digestive Endoscopy ·Keiko Niimi, Osamu Goto, Mitsuhiro Fujishiro, Shinya Kodashima, Satoshi Ono, Satoshi Mochizuki, Itsuko Asada‐Hirayama, Maki Konno‐Shimizu, (unknown), Chihiro Minatsuki, Nobutake Yamamichi, Kazuhiko Koike	47
15	Lifestyle factors affecting gastroesophageal reflux disease symptoms: a cross-sectional study of healthy 19864 adults using FSSG scores 2012 ·BMC Medicine ·Nobutake Yamamichi, Satoshi Mochizuki, Itsuko Asada‐Hirayama, (unknown), Takeshi Shimamoto, Maki Konno‐Shimizu, Yu Takahashi, Chihiro Takeuchi, Keiko Niimi, Satoshi Ono, Shinya Kodashima, Chihiro Minatsuki, Mitsuhiro Fujishiro, Toru Mitsushima, Kazuhiko Koike	82
16	Postprandial fullness correlates with rapid inflow of gastric content into duodenum but not with chronic gastritis 2011 ·BMC Gastroenterology ·Nobutake Yamamichi, Takeshi Shimamoto, Chihiro Minatsuki, Yoko Yoshida, Mitsuhiro Fujishiro, Shinya Kodashima, Jun Kato, Osamu Goto, Satoshi Ono, Keiko Niimi, Yu Takahashi, Maki Konno‐Shimizu, Masao Ichinose, Kazuhiko Koike	5
17	PROSPECTIVE SINGLE‐ARM TRIAL OF TWO‐WEEK RABEPRAZOLE TREATMENT FOR ULCER HEALING AFTER GASTRIC ENDOSCOPIC SUBMUCOSAL DISSECTION 2011 ·Digestive Endoscopy ·Keiko Niimi, Mitsuhiro Fujishiro, Osamu Goto, Shinya Kodashima, Chihiro Minatsuki, Itsuko Hirayama, Satoshi Mochizuki, Satoshi Ono, Nobutake Yamamichi, Naomi Kakushima, Masao Ichinose, Kazuhiko Koike	46
18	CONTROVERSY ON THE MANAGEMENT OF ANTICOAGULANTS AND ANTIPLATELET AGENTS FOR SCHEDULED ENDOSCOPY 2010 ·Digestive Endoscopy ·Satoshi Ono, Mitsuhiro Fujishiro, Shinya Kodashima, Chihiro Minatsuki, (unknown), Keiko Niimi, Osamu Goto, Nobutake Yamamichi, Kazuhiko Koike	3
19	Subserosal injection of hyaluronic acid may prevent perforation after endoscopic resection 2009 ·World Journal of Gastrointestinal Endoscopy ·Keiko Niimi	2
20	Crystal Structures of BchU, a Methyltransferase Involved in Bacteriochlorophyll c Biosynthesis, and its Complex with S-adenosylhomocysteine: Implications for Reaction Mechanism 2006 ·Journal of Molecular Biology ·Kei Wada, Hitomi Yamaguchi, Jiro Harada, Keiko Niimi, (unknown), Yoshitaka Saga, Hirozo Oh‐oka, Hitoshi Tamiaki, Keiichi Fukuyama	28

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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