Ellen Løkkegaard

5.6k total citations · 3 hit papers
119 papers, 3.6k citations indexed

About

Ellen Løkkegaard is a scholar working on Public Health, Environmental and Occupational Health, Obstetrics and Gynecology and Pediatrics, Perinatology and Child Health. According to data from OpenAlex, Ellen Løkkegaard has authored 119 papers receiving a total of 3.6k indexed citations (citations by other indexed papers that have themselves been cited), including 47 papers in Public Health, Environmental and Occupational Health, 38 papers in Obstetrics and Gynecology and 31 papers in Pediatrics, Perinatology and Child Health. Recurrent topics in Ellen Løkkegaard's work include Estrogen and related hormone effects (16 papers), Maternal and fetal healthcare (15 papers) and Maternal and Perinatal Health Interventions (15 papers). Ellen Løkkegaard is often cited by papers focused on Estrogen and related hormone effects (16 papers), Maternal and fetal healthcare (15 papers) and Maternal and Perinatal Health Interventions (15 papers). Ellen Løkkegaard collaborates with scholars based in Denmark, United States and Sweden. Ellen Løkkegaard's co-authors include Øjvind Lidegaard, Charlotte Wessel Skovlund, Niels Keiding, Lars Nielsen, Carsten Agger, Øjvind Lidegaard, A. L. Svendsen, Finn Egil Skjeldestad, Lina Steinrud Mørch and Thomas Bergholt and has published in prestigious journals such as New England Journal of Medicine, JAMA and SHILAP Revista de lepidopterología.

In The Last Decade

Ellen Løkkegaard

104 papers receiving 3.4k citations

Hit Papers

align trajectories

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.

Hormonal contraception and risk of venous thromboembolism: national follow-up study

2009 442 citations Ellen Løkkegaard et al. profile →
Risk of venous thromboembolism from use of oral contraceptives containing different progestogens and oestrogen doses: Danish cohort study, 2001-9

2011 388 citations Øjvind Lidegaard, Lars Nielsen et al. profile →
Thrombotic Stroke and Myocardial Infarction with Hormonal Contraception

2012 369 citations Øjvind Lidegaard, Ellen Løkkegaard et al. profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Ellen Løkkegaard Denmark	29	1.6k	810	708	657	639	119	3.6k
Richard Farmer United Kingdom	33	583 0.4×	331 0.4×	178 0.3×	468 0.7×	128 0.2×	91	3.3k
Ronald T. Burkman United States	42	2.2k 1.4×	1.9k 2.3×	1.8k 2.5×	424 0.6×	753 1.2×	164	6.0k
Mahesh Fuldeore United States	20	281 0.2×	324 0.4×	590 0.8×	176 0.3×	730 1.1×	32	2.9k
Joel Neugarten United States	40	584 0.4×	409 0.5×	199 0.3×	786 1.2×	196 0.3×	82	4.6k
Eyal Schiff Israel	40	1.5k 1.0×	2.5k 3.0×	2.6k 3.6×	76 0.1×	702 1.1×	166	5.0k
Daniel S. Seidman Israel	49	1.9k 1.2×	3.3k 4.1×	2.5k 3.6×	102 0.2×	2.3k 3.6×	264	7.4k
Bente Mertz Nørgård Denmark	31	1.6k 1.0×	395 0.5×	361 0.5×	61 0.1×	244 0.4×	154	3.8k
Mette Gislum Denmark	28	351 0.2×	212 0.3×	174 0.2×	279 0.4×	70 0.1×	40	2.1k
Évelyne Rey Canada	36	1.5k 0.9×	2.4k 2.9×	3.2k 4.6×	101 0.2×	89 0.1×	103	5.2k
Helgi Sigvaldason Iceland	32	305 0.2×	223 0.3×	143 0.2×	356 0.5×	103 0.2×	82	3.3k

Countries citing papers authored by Ellen Løkkegaard

Since Specialization

Citations

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

Fields of papers citing papers by Ellen Løkkegaard

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Ellen Løkkegaard

This figure shows the co-authorship network connecting the top 25 collaborators of Ellen Løkkegaard. A scholar is included among the top collaborators of Ellen Løkkegaard 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 Ellen Løkkegaard. Ellen Løkkegaard 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:

20 of 20 papers shown

Bogstad, Jeanette, Nina la Cour Freiesleben, Ellen Løkkegaard, et al.. (2026). Optimizing the protocol for modified natural cycle frozen embryo transfer (mNC-FET): a multicentre, single-blinded randomized controlled trial. Human Reproduction Open. 2026(1). hoag003–hoag003.

Løkkegaard, Ellen, et al.. (2025). The ambivalence of abortion: An explorative study on attitudes towards elective abortion and abortion limits among pregnant women in Denmark. Midwifery. 145. 104381–104381.

Løkkegaard, Ellen, et al.. (2025). Hormonal Contraception and Retinal Vascular Occlusion Risk. American Journal of Ophthalmology. 277. 286–294.

Jensen, Andreas Kryger, et al.. (2025). Predicting early cessation of exclusive breastfeeding using machine learning techniques. PLoS ONE. 20(1). e0312238–e0312238.

Petersen, Tonny Studsgaard, et al.. (2024). Mirtazapine in pregnancy and lactation: A systematic review of adverse outcomes. Acta Psychiatrica Scandinavica. 151(1). 6–32. 1 indexed citations

Mortensen, Ole Hartvig, Lennart Friis‐Hansen, Stig Mølsted, et al.. (2024). Effects of Physical Activity on Blood Lipids and Hemoglobin A1c in Healthy Pregnant Women: The FitMum Randomized Controlled Trial. Endocrine Practice. 30(10). 927–936. 2 indexed citations

Greisen, Gorm, Barbara Hoff Esbjørn, Ellen Løkkegaard, et al.. (2024). Five‐year neurodevelopmental assessment of extremely preterm or extremely low birthweight infants: Association with school performance. Acta Paediatrica. 114(1). 131–140. 1 indexed citations

Bogstad, Jeanette, Nina la Cour Freiesleben, Lisbeth Prætorius, et al.. (2024). Psychosocial and physical wellbeing in women and male partners undergoing immediate versus postponed modified natural cycle frozen embryo transfer after ovarian stimulation and oocyte pick-up: a sub-study of a randomized controlled trial. Human Reproduction. 40(1). 96–109. 1 indexed citations

Spangmose, Anne Lærke, Anna Klajnbard, Nina la Cour Freiesleben, et al.. (2023). Does luteal phase progesterone supplementation affect physical and psychosocial well-being among women undergoing modified natural cycle-FET? A sub-study of a randomized controlled trial. Human Reproduction. 38(10). 1970–1980. 3 indexed citations

10.

Mølsted, Stig, Tine D. Clausen, Ellen Løkkegaard, et al.. (2023). Methods to Estimate Energy Expenditure, Physical Activity, and Sedentary Time in Pregnant Women: A Validation Study Using Doubly Labeled Water. Journal for the Measurement of Physical Behaviour. 6(1). 88–98. 3 indexed citations

11.

Greisen, Gorm, et al.. (2023). Preterm children born below 33–35 weeks of gestation have an increased risk of mathematical difficulties. Acta Paediatrica. 113(2). 212–220.

12.

Petersen, Tonny Studsgaard, et al.. (2022). Mirtazapine exposure in pregnancy and fetal safety: A nationwide cohort study. Acta Psychiatrica Scandinavica. 145(6). 557–567. 13 indexed citations

13.

Axelsson, Paul, Anna J. M. Aabakke, Lene Nielsen, et al.. (2021). A prospective cohort study of confirmed severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) infection during pregnancy evaluating SARS‐CoV‐2 antibodies in maternal and umbilical cord blood and SARS‐CoV‐2 in vaginal swabs. Acta Obstetricia Et Gynecologica Scandinavica. 100(12). 2268–2277. 8 indexed citations

14.

Weimers, Petra, Dorit Vedel Ankersen, Søren Lophaven, et al.. (2021). Microscopic Colitis in Denmark: Regional Variations in Risk Factors and Frequency of Endoscopic Procedures. Journal of Crohn s and Colitis. 16(1). 49–56. 9 indexed citations

15.

Clausen, Tine D., Stig Mølsted, Andreas Kryger Jensen, et al.. (2021). Structured supervised exercise training or motivational counselling during pregnancy on physical activity level and health of mother and offspring: FitMum study protocol. BMJ Open. 11(3). e043671–e043671. 15 indexed citations

16.

Petersen, Tonny Studsgaard, Jón Trærup Andersen, Andreas Kryger Jensen, et al.. (2020). Validating the effect of Ondansetron and Mirtazapine In Treating hyperemesis gravidarum (VOMIT): protocol for a randomised placebo-controlled trial. BMJ Open. 10(3). e034712–e034712. 8 indexed citations

17.

Cortes, Dina, Anja Pinborg, Ellen Løkkegaard, et al.. (2016). A new model of paired clinical teaching of international and Danish medical students.. PubMed. 63(7). 7 indexed citations

18.

Løkkegaard, Ellen, et al.. (2014). Adolescent girls in Denmark use oral contraceptives at an increasingly young age, and with more pauses and shifts.. PubMed. 61(10). A4936–A4936. 9 indexed citations

19.

Bergholt, Thomas, et al.. (2013). Safe induction of labour with low-dose misoprostol, but less effective than the conventional dinoprostone regimen.. PubMed. 60(9). A4706–A4706. 5 indexed citations

20.

Lidegaard, Øjvind, Lars Nielsen, Charlotte Wessel Skovlund, Finn Egil Skjeldestad, & Ellen Løkkegaard. (2011). Risk of venous thromboembolism from use of oral contraceptives containing different progestogens and oestrogen doses: Danish cohort study, 2001-9. Research at the University of Copenhagen (University of Copenhagen). 3 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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