Tomiko Koyama

417 total citations
9 papers, 315 citations indexed

About

Tomiko Koyama is a scholar working on Epidemiology, Hepatology and Nephrology. According to data from OpenAlex, Tomiko Koyama has authored 9 papers receiving a total of 315 indexed citations (citations by other indexed papers that have themselves been cited), including 5 papers in Epidemiology, 3 papers in Hepatology and 2 papers in Nephrology. Recurrent topics in Tomiko Koyama's work include Liver Disease Diagnosis and Treatment (4 papers), Hepatitis C virus research (3 papers) and Oral microbiology and periodontitis research (2 papers). Tomiko Koyama is often cited by papers focused on Liver Disease Diagnosis and Treatment (4 papers), Hepatitis C virus research (3 papers) and Oral microbiology and periodontitis research (2 papers). Tomiko Koyama collaborates with scholars based in Japan, United States and Canada. Tomiko Koyama's co-authors include Hiroshi Yoshizawa, Junko Tanaka, Keiko Katayama, Ayumu Nakashima, Yuzo Miyakawa, Junko Matsuo, Tomoyuki Akita, Masaaki Mizui, Takashi Moriya and Kuniaki Ogasawara and has published in prestigious journals such as Journal of Psychosomatic Research, Atherosclerosis and Journal of Gastroenterology and Hepatology.

In The Last Decade

Tomiko Koyama

9 papers receiving 302 citations

Peers

Countries citing papers authored by Tomiko Koyama

Since Specialization

Citations

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

Fields of papers citing papers by Tomiko Koyama

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Tomiko Koyama

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

All Works

Sort: Min cites: Since: Top N: Style:

9 of 9 papers shown

#	Work	Indexed citations
1	Associations of number of teeth with risks for all‐cause mortality and cause‐specific mortality in middle‐aged and elderly men in the northern part of Japan: the Iwate‐KENCO study 2014 ·Community Dentistry And Oral Epidemiology ·(unknown), Kozo Tanno, Masaki Ohsawa, Toshiyuki Onoda, Kiyomi Sakata, Fumitaka Tanaka, Shinji Makita, Motoyuki Nakamura, Shinichi Omama, Kuniaki Ogasawara, Yasuhiro Ishibashi, Toru Kuribayashi, Tomiko Koyama, Kazuyoshi Itai, Akira Ogawa, Akira Okayama	27
2	Comparison of Predictability of Future Cardiovascular Events Between Chronic Kidney Disease (CKD) Stage Based on CKD Epidemiology Collaboration Equation and That Based on Modification of Diet in Renal Disease Equation in the Japanese General Population 2013 ·Circulation Journal ·Masaki Ohsawa, Kozo Tanno, Kazuyoshi Itai, Tanvir Chowdhury Turin, Tomonori Okamura, Akira Ogawa, Kuniaki Ogasawara, Tomoaki Fujioka, Toshiyuki Onoda, Yuki Yoshida, (unknown), Yasuhiro Ishibashi, Motoyuki Nakamura, Shinji Makita, Fumitaka Tanaka, Toru Kuribayashi, Tomiko Koyama, Kiyomi Sakata, Akira Okayama	26
3	Factors Related to Tooth Loss Among Community-Dwelling Middle-aged and Elderly Japanese Men 2013 ·Journal of Epidemiology ·(unknown), Masaki Ohsawa, Yumi Yaegashi, Kiyomi Sakata, Kozo Tanno, Toshiyuki Onoda, Kazuyoshi Itai, Fumitaka Tanaka, Shinji Makita, Shinichi Omama, Kuniaki Ogasawara, Akira Ogawa, Yasuhiro Ishibashi, Toru Kuribayashi, Tomiko Koyama, Akira Okayama	40
4	Poor self-rated health is significantly associated with elevated C-reactive protein levels in women, but not in men, in the Japanese general population 2012 ·Journal of Psychosomatic Research ·Kozo Tanno, Masaki Ohsawa, Toshiyuki Onoda, Kazuyoshi Itai, Kiyomi Sakata, Fumitaka Tanaka, Shinji Makita, Motoyuki Nakamura, Shinichi Omama, Kuniaki Ogasawara, Akira Ogawa, Yasuhiro Ishibashi, Toru Kuribayashi, Tomiko Koyama, Akira Okayama	26
5	Influence of mild-to-moderate alcohol consumption on cardiovascular diseases in men from the general population 2012 ·Atherosclerosis ·Shinji Makita, Toshiyuki Onoda, Masaki Ohsawa, Fumitaka Tanaka, Toshie Segawa, Tomohiro Takahashi, (unknown), Kazuyoshi Itai, Kozo Tanno, Kiyomi Sakata, Shinichi Omama, Yuki Yoshida, Yasuhiro Ishibashi, Tomiko Koyama, Toru Kuribayashi, Kuniaki Ogasawara, Akira Ogawa, Akira Okayama, Motoyuki Nakamura	15
6	Total Numbers of Undiagnosed Carriers of Hepatitis C and B Viruses in Japan Estimated by Age- and Area-Specific Prevalence on the National Scale 2011 ·Intervirology ·Junko Tanaka, Tomiko Koyama, Masaaki Mizui, (unknown), Keiko Katayama, Junko Matsuo, Tomoyuki Akita, Ayumu Nakashima, Yuzo Miyakawa, Hiroshi Yoshizawa	121
7	Serum C-Reactive Protein Levels and Death and Cardiovascular Events in Mild to Moderate Chronic Kidney Disease 2011 ·International Heart Journal ·(unknown), Motoyuki Nakamura, Fumitaka Tanaka, Toshiyuki Onoda, Kazuyoshi Itai, Kozo Tanno, Masaki Ohsawa, Shinji Makita, Yasuhiro Ishibashi, Tomiko Koyama, Yuki Yoshida, Shinichi Omama, Kuniaki Ogasawara, Akira Ogawa, Toru Kuribayashi, Akira Okayama	8
8	Epidemiology of Hepatitis C Virus in Japan 1999 ·Intervirology ·Takashi Moriya, Tomiko Koyama, Junko Tanaka, Shunji Mishiro, Hiroshi Yoshizawa	46
9	Antibodies to hepatitis C virus and elevated transaminase levels in a town of hyperendemicity in Iwate, Japan 1997 ·Journal of Gastroenterology and Hepatology ·Tomiko Koyama, Fumio Tsuda, Kazuyoshi Ishikawa, Hiroshi Oishi, (unknown), Hiroshi Yoshizawa, Shunichi Sato, Hiroaki Okamoto	6

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.

Explore authors with similar magnitude of impact