Masaru Koizumi

4.6k total citations · 1 hit paper
157 papers, 3.6k citations indexed

About

Masaru Koizumi is a scholar working on Surgery, Oncology and Epidemiology. According to data from OpenAlex, Masaru Koizumi has authored 157 papers receiving a total of 3.6k indexed citations (citations by other indexed papers that have themselves been cited), including 97 papers in Surgery, 51 papers in Oncology and 25 papers in Epidemiology. Recurrent topics in Masaru Koizumi's work include Pancreatitis Pathology and Treatment (41 papers), Pancreatic and Hepatic Oncology Research (36 papers) and Neuroendocrine Tumor Research Advances (16 papers). Masaru Koizumi is often cited by papers focused on Pancreatitis Pathology and Treatment (41 papers), Pancreatic and Hepatic Oncology Research (36 papers) and Neuroendocrine Tumor Research Advances (16 papers). Masaru Koizumi collaborates with scholars based in Japan, United States and Australia. Masaru Koizumi's co-authors include Tooru Shimosegawa, Takayoshi Toyota, Makoto Otsuki, Toshihiko Yada, Naohiro Sata, Seiki Matsuno, Masahiko Hirota, Akihiko Satoh, Kennichi Satoh and Hideo Nagai and has published in prestigious journals such as Nucleic Acids Research, Journal of Clinical Investigation and SHILAP Revista de lepidopterología.

In The Last Decade

Masaru Koizumi

147 papers receiving 3.4k 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.

Clinical diagnostic criteria of autoimmune pancreatitis: revised proposal

2006 452 citations Kazuichi Okazaki, Shigeyuki Kawa et al. Journal of Gastroenterology profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Masaru Koizumi Japan	31	2.3k	1.1k	713	492	443	157	3.6k
Pier Franco Pignatti Italy	39	837 0.4×	277 0.2×	456 0.6×	390 0.8×	1.1k 2.4×	142	4.4k
Rebekah Karns United States	27	1.0k 0.5×	503 0.4×	671 0.9×	151 0.3×	1.1k 2.5×	75	3.0k
Toshio Doi Japan	37	890 0.4×	467 0.4×	286 0.4×	189 0.4×	1.4k 3.2×	169	4.9k
Toru Inoue Japan	30	498 0.2×	586 0.5×	222 0.3×	115 0.2×	877 2.0×	211	3.1k
Frank G. Schaap Netherlands	38	1.7k 0.7×	1.3k 1.1×	1.4k 2.0×	134 0.3×	2.2k 5.0×	108	5.2k
E. Kivilaakso Finland	45	4.1k 1.8×	1.5k 1.3×	386 0.5×	64 0.1×	1.0k 2.3×	185	6.3k
Wolfgang Schepp Germany	29	2.0k 0.9×	234 0.2×	387 0.5×	131 0.3×	548 1.2×	179	3.2k
Seiji Suzuki Japan	31	679 0.3×	283 0.2×	1.2k 1.7×	91 0.2×	1.0k 2.3×	184	3.6k
Hideyuki Fusamoto Japan	44	1.2k 0.5×	260 0.2×	2.9k 4.1×	600 1.2×	962 2.2×	188	5.9k
Ingemar Ihse Sweden	38	3.1k 1.4×	2.2k 1.9×	915 1.3×	47 0.1×	597 1.3×	209	4.7k

Countries citing papers authored by Masaru Koizumi

Since Specialization

Citations

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

Fields of papers citing papers by Masaru Koizumi

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Masaru Koizumi

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

Kobayashi, F., Jun Watanabe, Masaru Koizumi, & Naohiro Sata. (2023). Efficacy and safety of mesh non-fixation in patients undergoing laparo-endoscopic repair of groin hernia: a systematic review and meta-analysis. Hernia. 27(6). 1415–1427. 8 indexed citations

Watanabe, Jun, Atsushi Miki, Masaru Koizumi, Kazuhiko Kotani, & Naohiro Sata. (2021). Effect of Postoperative Coffee Consumption on Postoperative Ileus after Abdominal Surgery: An Updated Systematic Review and Meta-Analysis. Nutrients. 13(12). 4394–4394. 19 indexed citations

Endo, Kazuhiro, Masaru Koizumi, Hideki Sasanuma, et al.. (2021). A structured program for teaching pancreatojejunostomy to surgical residents and fellows outside the operating room: a pilot study. BMC Surgery. 21(1). 102–102. 2 indexed citations

Yokota, Shinichiro, et al.. (2019). Preoperative pulmonary function tests do not predict the development of pulmonary complications after elective major abdominal surgery: A prospective cohort study. International Journal of Surgery. 73. 65–71. 4 indexed citations

Koizumi, Masaru, Naohiro Sata, Naoya Kasahara, et al.. (2012). Participation of Surgical Residents Does Not Adversely Affect the Outcome of Inguinal Hernia Repair in an Integrated Teaching Program. Journal of surgical education. 69(5). 605–610. 3 indexed citations

Hyodo, Masanobu, Masaru Koizumi, Yasunaru Sakuma, et al.. (2011). A case of hepatocellular carcinoma with hyperlipidemia. Kanzo. 52(2). 126–130. 1 indexed citations

Koizumi, Masaru, et al.. (2010). INGUINAL HERNIA IPSILATERAL TO THE TRANSPLANTED KIDNEY -TWO CASE REPORTS-. Nihon Rinsho Geka Gakkai Zasshi (Journal of Japan Surgical Association). 71(7). 1905–1908. 3 indexed citations

Inoue, Yoshiyuki, Masaru Koizumi, Yasunaru Sakuma, Naohiro Sata, & Yoshikazu Yasuda. (2009). A Case of Emphysematous Colonoscopy Cholecystitis. The Japanese Journal of Gastroenterological Surgery. 42(9). 1496–1500.

Koizumi, Masaru, Naohiro Sata, Toru Hamada, & Yoshikazu Yasuda. (2009). A Case of Acute Peritonitis Induced by a Perforated Jejunal Diverticulum. The Japanese Journal of Gastroenterological Surgery. 42(8). 1430–1435. 3 indexed citations

10.

Kawa, Shigeyuki, Kenji Notohara, Takashi Hatori, et al.. (2008). Differential diagnosis between autoimmune pancreatitis and pancreatic cancer. Suizo. 23(5). 555–569. 6 indexed citations

11.

Okazaki, Kazuichi, Shigeyuki Kawa, Terumi Kamisawa, et al.. (2007). CLINICAL DIAGNOSTIC CRITERIA OF AUTOIMMUNE PANCREATITIS 2006. Pancreas. 35(1). 86–86. 11 indexed citations

12.

Takeda, Kazunori, Tadahiro Takada, Yoshifumi Kawarada, et al.. (2006). JPN Guidelines for the management of acute pancreatitis: medical management of acute pancreatitis. Journal of Hepato-Biliary-Pancreatic Surgery. 13(1). 42–47. 87 indexed citations

13.

Hirota, Masahiko, Tadahiro Takada, Yoshifumi Kawarada, et al.. (2006). JPN Guidelines for the management of acute pancreatitis: severity assessment of acute pancreatitis. Journal of Hepato-Biliary-Pancreatic Surgery. 13(1). 33–41. 64 indexed citations

14.

Koizumi, Masaru, et al.. (2005). A CASE OF OBSTRUCTION OF THE DESCENDING COLON CANCER WHICH COULD NOT BUT CHOOSE COLONIC STENT DETENTION. Acta gastro-enterologica belgica. 47(1). 42–48. 1 indexed citations

15.

Okazaki, Kazuichi, Shigeyuki Kawa, Terumi Kamisawa, et al.. (2005). . Suizo. 20(6). 560–563. 1 indexed citations

16.

Kashiwagi, Hiroshi, Kyotaro Kanazawa, Masaru Koizumi, Hiroyuki Shibusawa, & Allan D. Spigelman. (2000). Development of duodenal cancer in a patient with familial adenomatous polyposis. Journal of Gastroenterology. 35(11). 856–860. 8 indexed citations

17.

Homma, Tatsuji, Hideo Harada, & Masaru Koizumi. (1997). Diagnostic Criteria for Chronic Pancreatitis by the Japan Pancreas Society. Pancreas. 15(1). 14–15. 101 indexed citations

18.

Pimenta, Cibele Andrucioli de Mattos, et al.. (1993). [Pain: its occurrence and evolution in the postoperative period of heart and abdominal surgery].. PubMed. 11(1). 3–10. 1 indexed citations

19.

Satoh, Kennichi, Hironobu Sasano, Tooru Shimosegawa, et al.. (1993). An immunohistochemical study of the c-erbB-2 oncogene product in intraductal mucin-hypersecreting neoplasms and in ductal cell carcinomas of the pancreas. Cancer. 72(1). 51–56. 57 indexed citations

20.

Kano, Hideaki, Masaru Koizumi, Hiroaki Noda, et al.. (1992). Nucleotide sequence of capsid protein gene of rice tungro bacilliform virus. Archives of Virology. 124(1-2). 157–163. 25 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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