Aya Koyanagi

29 papers and 149 indexed citations i.

About

Aya Koyanagi is a scholar working on Obstetrics and Gynecology, Pediatrics, Perinatology and Child Health and Epidemiology. According to data from OpenAlex, Aya Koyanagi has authored 29 papers receiving a total of 149 indexed citations (citations by other indexed papers that have themselves been cited), including 16 papers in Obstetrics and Gynecology, 15 papers in Pediatrics, Perinatology and Child Health and 13 papers in Epidemiology. Recurrent topics in Aya Koyanagi’s work include Pregnancy and preeclampsia studies (14 papers), Congenital Heart Disease Studies (13 papers) and Maternal and fetal healthcare (6 papers). Aya Koyanagi is often cited by papers focused on Pregnancy and preeclampsia studies (14 papers), Congenital Heart Disease Studies (13 papers) and Maternal and fetal healthcare (6 papers). Aya Koyanagi collaborates with scholars based in Japan and Egypt. Aya Koyanagi's co-authors include Toshiyuki Hata, Takahito Miyake, Yasunari Miyagi, Junko Noguchi, A Metin Gülmezoglu, Hirokazu Tanaka, Ayush Dagvadorj, João Paulo Souza, Yasuo Nakahara and Hisashi Masuyama and has published in prestigious journals such as Ultrasound in Obstetrics and Gynecology, International Journal of Gynecology & Obstetrics and Journal of Ultrasound in Medicine.

In The Last Decade

Co-authorship network of co-authors of Aya Koyanagi i

Fields of papers citing papers by Aya Koyanagi

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Countries citing papers authored by Aya Koyanagi

Since Specialization
Citations

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

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2026