Karin Källén

12.2k total citations · 4 hit papers
239 papers, 7.8k citations indexed

About

Karin Källén is a scholar working on Pediatrics, Perinatology and Child Health, Obstetrics and Gynecology and Pulmonary and Respiratory Medicine. According to data from OpenAlex, Karin Källén has authored 239 papers receiving a total of 7.8k indexed citations (citations by other indexed papers that have themselves been cited), including 151 papers in Pediatrics, Perinatology and Child Health, 93 papers in Obstetrics and Gynecology and 79 papers in Pulmonary and Respiratory Medicine. Recurrent topics in Karin Källén's work include Neonatal Respiratory Health Research (77 papers), Birth, Development, and Health (45 papers) and Pregnancy and preeclampsia studies (45 papers). Karin Källén is often cited by papers focused on Neonatal Respiratory Health Research (77 papers), Birth, Development, and Health (45 papers) and Pregnancy and preeclampsia studies (45 papers). Karin Källén collaborates with scholars based in Sweden, Norway and Denmark. Karin Källén's co-authors include Karel Maršál, Bëngt Källén, Fredrik Serenius, Mikael Norman, Ann Thurin‐Kjellberg, Lena Hellström‐Westas, Christina Bergh, Per Olofsson, Bo Jacobsson and Andreas Herbst and has published in prestigious journals such as JAMA, PLoS ONE and The Science of The Total Environment.

In The Last Decade

Karin Källén

223 papers receiving 7.6k citations

Hit Papers

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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.

One-Year Survival of Extremely Preterm Infants After Active Perinatal Care in Sweden

2009 487 citations Lena Hellström‐Westas, Mikael Norman et al. profile →
Neurodevelopmental Outcome in Extremely Preterm Infants at 2.5 Years After Active Perinatal Care in Sweden

2013 396 citations Fredrik Serenius, Karin Källén et al. profile →
Association Between Year of Birth and 1-Year Survival Among Extremely Preterm Infants in Sweden During 2004-2007 and 2014-2016

2019 199 citations Mikael Norman, Boubou Hallberg et al. profile →
The Swedish medical birth register during five decades: documentation of the content and quality of the register

2023 149 citations Karin Källén, Olof Stephansson et al. profile →

Author Peers

Peers are selected by citation overlap in the author's most active subfields. citations · hero ref

Author						Papers	Cites
Karin Källén	5.0k	2.3k	2.3k	2.0k	905	239	7.8k
Monique Kaminski	6.4k 1.3×	3.2k 1.3×	2.1k 0.9×	2.3k 1.1×	1.7k 1.8×	223	10.1k
Lorentz M. Irgens	5.6k 1.1×	1.6k 0.7×	4.3k 1.9×	2.5k 1.3×	1.3k 1.4×	202	11.1k
Karel Maršál	6.0k 1.2×	3.0k 1.3×	4.2k 1.8×	938 0.5×	1.1k 1.2×	299	9.2k
Pierre‐Yves Ancel	4.8k 1.0×	3.3k 1.4×	1.3k 0.6×	1.2k 0.6×	1.5k 1.7×	230	7.5k
Johan Karlberg	3.5k 0.7×	937 0.4×	1.1k 0.5×	1.9k 0.9×	654 0.7×	144	8.5k
Lesley McCowan	5.9k 1.2×	1.0k 0.4×	6.6k 2.9×	2.2k 1.1×	1.1k 1.2×	274	10.1k
Olof Stephansson	4.2k 0.8×	955 0.4×	4.6k 2.0×	3.8k 1.9×	1.5k 1.7×	272	11.2k
Thomas C. Hulsey	2.4k 0.5×	1.4k 0.6×	1.5k 0.7×	1.2k 0.6×	935 1.0×	155	6.2k
Uma M. Reddy	6.0k 1.2×	957 0.4×	5.6k 2.4×	2.5k 1.3×	743 0.8×	271	9.0k
Sarah D. McDonald	4.0k 0.8×	849 0.4×	3.9k 1.7×	2.4k 1.2×	1.0k 1.1×	226	7.9k

Countries citing papers authored by Karin Källén

Since Specialization

Citations

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

Fields of papers citing papers by Karin Källén

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Karin Källén

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

Gissler, Mika, Karin Källén, Kari Klungsøyr, et al.. (2025). Timing of Term Births and Associated Mortality Risks: Ecological Analysis Across 28 European Countries. BJOG An International Journal of Obstetrics & Gynaecology. 132(11). 1655–1663.

Gadsbøll, Christian, Lars Björklund, Mikael Norman, et al.. (2024). Centralisation of extremely preterm births and decreased early postnatal mortality in Sweden, 2004‐2007 versus 2014‐2016. Acta Paediatrica. 114(2). 319–331. 2 indexed citations

Farooqi, Aijaz, Stellan Håkansson, Fredrik Serenius, et al.. (2023). One-year survival and outcomes of infants born at 22 and 23 weeks of gestation in Sweden 2004–2007, 2014–2016 and 2017–2019. Archives of Disease in Childhood Fetal & Neonatal. 109(1). 10–17. 12 indexed citations

Källén, Karin, et al.. (2023). Gestational diabetes mellitus and time in active labor: A population‐based cohort study. Acta Obstetricia Et Gynecologica Scandinavica. 102(7). 873–882. 4 indexed citations

Vilhelmsson, Andreas, et al.. (2023). Maternal Serum Concentrations of Per- and Polyfluoroalkyl Substances in Early Pregnancy and Small for Gestational Age in Southern Sweden. Toxics. 11(9). 750–750. 2 indexed citations

Engjom, Hilde, Anna J. M. Aabakke, Kari Klungsøyr, et al.. (2021). COVID‐19 in pregnancy—characteristics and outcomes of pregnant women admitted to hospital because of SARS‐CoV‐2 infection in the Nordic countries. Acta Obstetricia Et Gynecologica Scandinavica. 100(9). 1611–1619. 29 indexed citations

Maršál, Karel, et al.. (2021). Detection and clinical outcome of small‐for‐gestational‐age fetuses in the third trimester—A comparison between routine ultrasound examination and examination on indication. Acta Obstetricia Et Gynecologica Scandinavica. 101(1). 102–110. 4 indexed citations

Källén, Karin, et al.. (2019). The effect of maternal body mass index on duration of induced labor. Acta Obstetricia Et Gynecologica Scandinavica. 99(5). 669–678. 9 indexed citations

Norman, Mikael, Boubou Hallberg, Thomas Abrahamsson, et al.. (2019). Association Between Year of Birth and 1-Year Survival Among Extremely Preterm Infants in Sweden During 2004–2007 and 2014–2016. Obstetrical & Gynecological Survey. 74(8). 456–458. 64 indexed citations

10.

Källén, Karin, et al.. (2018). Maternal plasma leptin levels in relation to the duration of the active phase of labor. Acta Obstetricia Et Gynecologica Scandinavica. 97(10). 1248–1256. 6 indexed citations

11.

Källén, Karin, et al.. (2016). Results from the National Perinatal Patient Safety Program in Sweden: the challenge of evaluation. Acta Obstetricia Et Gynecologica Scandinavica. 95(5). 596–603. 11 indexed citations

12.

Källén, Karin, et al.. (2016). Prospective population‐based cohort study of maternal obesity as a source of error in gestational age estimation at 11–14 weeks. Acta Obstetricia Et Gynecologica Scandinavica. 95(11). 1281–1287. 7 indexed citations

13.

Henningsen, Anna-Karina Aaris, Karin Källén, Christina Bergh, et al.. (2014). Cancer in children and young adults born after assisted reproductive technology: a Nordic cohort study from the Committee of Nordic ART and Safety (CoNARTaS). WOS. 2 indexed citations

14.

Serenius, Fredrik, Karin Källén, Mats Blennow, et al.. (2013). Neurodevelopmental Outcome in Extremely Preterm Infants at 2.5 Years After Active Perinatal Care in Sweden. Obstetrical & Gynecological Survey. 68(12). 781–783.

15.

Sazonova, A., Karin Källén, Ann Thurin‐Kjellberg, Ulla‐Britt Wennerholm, & Christina Bergh. (2010). Obstetric outcome after in vitro fertilization with single or double embryo transfer. Human Reproduction. 26(2). 442–450. 70 indexed citations

16.

Bryman, Inger, et al.. (2010). Perinatal outcome in women with Turner karyotype. Human Reproduction. 25. 23–23. 1 indexed citations

17.

Austeng, Dordi, Karin Källén, Uwe Ewald, et al.. (2009). ROP in Extremely Immature Infants Born Before 27 Weeks of Gestation Between 2004 and 2007 in Sweden - The EXPRESS Study (EXtremely PREterm Infants Study in Sweden). Investigative Ophthalmology & Visual Science. 50(13). 3139–3139. 1 indexed citations

18.

Hellström‐Westas, Lena, Isis Amer‐Wåhlin, Johan Ågren, & Karin Källén. (2008). INCIDENCE AND RISK FACTORS FOR NEONATAL SEIZURES IN SWEDEN. Archives of Disease in Childhood. 93. 3 indexed citations

19.

Källén, Karin, et al.. (2005). Kejsarsnitt I Sverige 1990-2001. Lund University Publications (Lund University). 2 indexed citations

20.

Källén, Karin. (1998). Maternal smoking and twinning. Twin Research. 1(4). 206–211. 4 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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