O Koller
- Obstetrics and Gynecology top 5%
- Hematology top 10%
- Pediatrics, Perinatology and Child Health
- Genetics
- Pulmonary and Respiratory Medicine
- Co-authors
- Norvald SagenRoar SandveiM UlsteinKjell HaramPer BergsjøAlexander PihlStein Tore NilsenPer Kolstad
- Topics
- Pregnancy and preeclampsia studies (5 papers)Iron Metabolism and Disorders (5 papers)Hemoglobinopathies and Related Disorders (4 papers)
In The Last Decade
O Koller
23 papers receiving 290 citations
Peers
Comparison fields: 5 of 59
- Obstetrics and Gynecology 203
- Hematology 101
- Pediatrics, Perinatology and Child Health 92
- Genetics 68
- Pulmonary and Respiratory Medicine 36
Countries citing papers authored by O Koller
This map shows the geographic impact of O Koller'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 O Koller with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites O Koller more than expected).
Fields of papers citing papers by O Koller
This network shows the impact of papers produced by O Koller. 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 O Koller. The network helps show where O Koller may publish in the future.
Co-authorship network of co-authors of O Koller
This figure shows the co-authorship network connecting the top 25 collaborators of O Koller. A scholar is included among the top collaborators of O Koller 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 O Koller. O Koller is excluded from the visualization to improve readability, since they are connected to all nodes in the network.
All Works
| # | Work | Indexed citations |
|---|---|---|
| 1 | Mumps mistaken for rubella in the first trimester of pregnancy. The role of the microbiology laboratory in the diagnosis of the infection. A case report. | 0 |
| 2 | 3 | |
| 3 | 5 | |
| 4 | [Maternal hemoglobin concentration and the fetus. A reevaluation]. | 1 |
| 5 | [Maternal mortality in Norway 1951-80]. | 3 |
| 6 | 76 | |
| 7 | 31 | |
| 8 | 45 | |
| 9 | 49 | |
| 10 | 21 | |
| 11 | 1 | |
| 12 | 6 | |
| 13 | 4 | |
| 14 | 5 | |
| 15 | 1 | |
| 16 | 4 | |
| 17 | 5 | |
| 18 | 1 | |
| 19 | 11 | |
| 20 | 27 |
About O Koller
O Koller is a scholar working on Obstetrics and Gynecology, Hematology and Genetics, having authored 24 papers that have together received 342 indexed citations. Recurring topics across this work include Pregnancy and preeclampsia studies (5 papers), Iron Metabolism and Disorders (5 papers) and Hemoglobinopathies and Related Disorders (4 papers). The work is most often cited by research in Obstetrics and Gynecology (203 citations), Hematology (101 citations) and Genetics (68 citations). O Koller has collaborated with scholars based in Norway and Denmark. Frequent co-authors include Norvald Sagen, Roar Sandvei, M Ulstein, Kjell Haram, Per Bergsjø, Alexander Pihl, Stein Tore Nilsen, Per Kolstad, Tore Sanner and Hyun Chan Kim. Their work appears in journals such as American Journal of Obstetrics and Gynecology, BJOG An International Journal of Obstetrics & Gynaecology and International Journal of Gynecology & Obstetrics.
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.