Koji Nishijima

82 papers and 546 indexed citations i.

About

Koji Nishijima is a scholar working on Surgery, Pediatrics, Perinatology and Child Health and Obstetrics and Gynecology. According to data from OpenAlex, Koji Nishijima has authored 82 papers receiving a total of 546 indexed citations (citations by other indexed papers that have themselves been cited), including 24 papers in Surgery, 23 papers in Pediatrics, Perinatology and Child Health and 22 papers in Obstetrics and Gynecology. Recurrent topics in Koji Nishijima’s work include Maternal and fetal healthcare (17 papers), Maternal and Perinatal Health Interventions (16 papers) and Ectopic Pregnancy Diagnosis and Management (9 papers). Koji Nishijima is often cited by papers focused on Maternal and fetal healthcare (17 papers), Maternal and Perinatal Health Interventions (16 papers) and Ectopic Pregnancy Diagnosis and Management (9 papers). Koji Nishijima collaborates with scholars based in Japan, United States and Greece. Koji Nishijima's co-authors include Fumikazu Kotsuji, Ken‐ichi Shukunami, Takayuki Enomoto, Takashi Fujimura, Tomoharu Miyashita, Sachio Fushida, Koichi Miwa, Itasu Ninomiya, Kazufumi Haino and Takanori Hattori and has published in prestigious journals such as Annals of Surgery, Scientific Reports and Journal of Affective Disorders.

In The Last Decade

Co-authorship network of co-authors of Koji Nishijima i

Fields of papers citing papers by Koji Nishijima

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Countries citing papers authored by Koji Nishijima

Since Specialization
Citations

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

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

Rankless by CCL
2025