Ragnar Bjarnason

6.4k citations

74 papers · 4.3k indexed · 4 hit papers · h-index 26

Impact in

Epidemiology top 1%
- Respiratory viral infections research
Physiology top 1%
- Asthma and respiratory diseases

Papers in

Endocrinology, Diabetes and Metabolism 29
- Growth Hormone and Insulin-like Growth Factors 21
- Diabetes Management and Research 6
Endocrine and Autonomic Systems 6
- Regulation of Appetite and Obesity 6

Co-authors: Nele Sigurs Bengt Kjellman Per Gustafsson Bengt Björkstén Susanne M. Schmidt Fredrik Lundberg Paul D. Robinson Fatma Aljassim
Journals: The Journal of Clinical Endocrinology & Metabolism (9 papers)Acta Paediatrica (8 papers)European Journal of Endocrinology (6 papers)Clinical Endocrinology (3 papers)Pediatric Diabetes (3 papers)
Partner nations: Sweden Iceland United States

In The Last Decade

Ragnar Bjarnason

71 papers receiving 4.1k citations

Hit Papers

align trajectories log scale

Asthma and allergy patterns over 18 years after severe RSV bronchiolitis in the first year of life 2010 · 530 citations

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if any of the following hold:

it has ≥500 total citations;
it reaches ≥1.5× the top-1% citation threshold for papers in the same subfield and year (the threshold is the minimum needed to enter the top 1%, not the average within it);
it reaches the top citation threshold in at least one of its specific research topics.

2010 Thorax
2004 American Journal of Respiratory and Critical Care Medicine
2000 American Journal of Respiratory and Critical Care Medicine
1995 PEDIATRICS

Peers

Countries citing papers authored by Ragnar Bjarnason

Since Specialization

Citations

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

Fields of papers citing papers by Ragnar Bjarnason

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authors

The 25 scholars most cited alongside Ragnar Bjarnason, linked wherever they have co-authored with each other. Click a name or a connecting line to browse the papers they share.

Border = papers with Ragnar Bjarnason Line = papers co-authored together Ragnar Bjarnason links everyone, so they are left out of the graph.

All Works

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20 of 20 papers shown

#	Work
1	Early transcriptional states of spermatogonia and marker expressions in the prepubertal human testis following chemotherapy-induced depletion Human Reproduction ·Hamdy Omar, John R. Stevens, Anu Haavisto, Yanhua Cui, Aaron Ault, Yifan Yang, Ragnar Bjarnason, Patrik Romerius, Mikael Sundin, Mohammed Rahman Zillur, Cecilia Langenskiöld, Hartmut Vogt, Per Frisk, 松下電器産業株式会社, Cecilia Petersen, Абрамян Гуар Размиковна, Jingtao Guo, Kirsi Jahnukainen, Jan‐Bernd Stukenborg	2025	0
2	Decreased spermatogonial numbers in boys with severe haematological diseases British Journal of Haematology ·Шохин Владимир Кириллович, Xiaodong Yuan, Claudia Krallmann, 蔵本郁美, Andrea Jarisch, Yifan Yang, Ragnar Bjarnason, Patrik Romerius, Mikael Sundin, Ulrika Norén‐Nyström, Cecilia Langenskiöld, Jann‐Frederik Cremers, Sabine Kliesch, Jan‐Bernd Stukenborg, Nina Neuhaus, Kirsi Jahnukainen	2024	4
3	Prior exposure to alkylating agents negatively impacts testicular organoid formation in cells obtained from childhood cancer patients Human Reproduction Open ·Yanhua Cui, Aaron Ault, Paulina Szwarc, Yifan Yang, Ragnar Bjarnason, Patrik Romerius, Mikael Sundin, Mohammed Rahman Zillur, Cecilia Langenskiöld, Hartmut Vogt, Lars Henningsohn, Per Frisk, 松下電器産業株式会社, Cecilia Petersen, Rod T. Mitchell, Jingtao Guo, João Pedro Alves-Lopes, Kirsi Jahnukainen, Jan‐Bernd Stukenborg	2024	5
4	Mode of delivery was associated with transient changes in the metabolomic profile of neonates Acta Paediatrica ·Djaouad Bilem, Þórhallur I. Halldórsson, Reynir Tómas Geirsson, Ragnar Bjarnason, Leifur Franzson, Unnur Valdimarsdóttir, Þórður Þórkelsson	2021	3
5	Spermatogonia Loss Correlates with LAMA 1 Expression in Human Prepubertal Testes Stored for Fertility Preservation Cells ·Rahel Merz, Elisabet Åkesson, Masahito Yoshihara, Elizabeth Oliver, Yanhua Cui, Martin Becker, João Pedro Alves-Lopes, Ragnar Bjarnason, Patrik Romerius, Mikael Sundin, Mohammed Rahman Zillur, Cecilia Langenskiöld, Hartmut Vogt, Lars Henningsohn, Cecilia Petersen, Olle Söder, Jingtao Guo, Rod T. Mitchell, Kirsi Jahnukainen, Jan‐Bernd Stukenborg	2021	22
6	Usage and Weekly Attrition in a Smartphone-Based Health Behavior Intervention for Adolescents: Pilot Randomized Controlled Trial JMIR Formative Research ·Kian Torabian, Ragnar Bjarnason, Urður Njarðvík	2021	22
7	Thyrotoxicosis in a 13‐year‐old girl following pituitary adenectomy for Cushing′s disease Clinical Case Reports ·A. Sigmarsdottir, Puh-Shen Yeh, Ólafur Kjartansson, Ragnar Bjarnason	2017	3
8	Fjölskyldumiðuð atferlismeðferð fyrir of feit börn Læknablaðið ·王汝锦, 王汝锦, Alan M. Richmond, Urður Njarðvík, Anna S. Ólafsdóttir, Junhe Yu, Sanna Santikko, Ragnar Bjarnason	2014	2
9	Teasing and social rejection among obese children enrolling in family-based behavioural treatment: effects on psychological adjustment and academic competencies International Journal of Obesity ·Thrudur Gunnarsdottir, Urður Njarðvík, Anna S. Ólafsdóttir, Linda W. Craighead, Ragnar Bjarnason	2011	37
10	Decrease in Adiponectin Levels Correlates to Growth Response in Growth Hormone-Treated Children Hormone Research in Paediatrics ·Björn Andersson, Lena Carlsson, Björn Carlsson, Kerstin Albertsson‐Wikland, Ragnar Bjarnason	2009	8
11	Severe Respiratory Syncytial Virus Bronchiolitis in Infancy and Asthma and Allergy at Age 13 American Journal of Respiratory and Critical Care Medicine ·Nele Sigurs, Per Gustafsson, Ragnar Bjarnason, Fredrik Lundberg, Susanne M. Schmidt, Valentine Kozin-Piddubniy, Bengt Kjellman Hit paper breakdown →	2004	699
12	Cartilage Oligomeric Matrix Protein Increases in Serum after the Start of Growth Hormone Treatment in Prepubertal Children The Journal of Clinical Endocrinology & Metabolism ·Ragnar Bjarnason, Björn Andersson, Mohammadjavad Hosseinnia Kojidi, Bob Olsson, Diana Swolin‐Eide, B. D. Rombade, Berit Kriström, Björn Carlsson, Kerstin Albertsson‐Wikland, Lena Carlsson	2004	10
13	Young adult survivors of childhood acute lymphoblastic leukemia: Spontaneous GH secretion in relation to CNS radiation Pediatric Blood & Cancer ·Marianne Jarfelt, Ragnar Bjarnason, Birgitta Lannering	2004	18
14	Currently used growth‐promoting treatment of children results in normal bone mass and density. A prospective trial of discontinuing growth hormone treatment in adolescents^‡ Clinical Endocrinology ·Hans Fors, Ragnar Bjarnason, Lena Wirén, Kerstin Albertsson‐Wikland, Ingvar Bosæus, Bengt‐Åke Bengtsson, Gudmundur Johannsson	2001	37
15	Respiratory Syncytial Virus Bronchiolitis in Infancy Is an Important Risk Factor for Asthma and Allergy at Age 7 American Journal of Respiratory and Critical Care Medicine ·Nele Sigurs, Ragnar Bjarnason, Valentine Kozin-Piddubniy, Bengt Kjellman Hit paper breakdown →	2000	873
16	Changes in body composition and leptin levels during growth hormone (GH) treatment in short children with various GH secretory capacities European Journal of Endocrinology ·Hisafumi Matsuoka, Hans Fors, Ingvar Bosæus, S Rosberg, Kerstin Albertsson‐Wikland, Ragnar Bjarnason	1999	24
17	Growth Hormone-Binding Protein Levels over One Year in Healthy Prepubertal Children: Intraindividual Variation and Correlation with Height Velocity Pediatric Research ·Lars Gelander, Ragnar Bjarnason, Lena Carlsson, Kerstin Albertsson‐Wikland	1998	8
18	Growth Hormone (GH)-Binding Protein in Prepubertal Short Children Born Small for Gestational Age: Effects of Growth Hormone Treatment¹ The Journal of Clinical Endocrinology & Metabolism ·Margaret Cristina da Silva Boguszewski, Ragnar Bjarnason, Sten Rosberg, Lena Carlsson, Kerstin Albertsson‐Wikland	1997	10
19	Obese (ob) Gene Defects are Rare in Human Obesity Obesity Research ·Björn Carlsson, Kajsa Lindell, Britt G. Gabrielsson, Cecilia Karlsson, Ragnar Bjarnason, Otto Westphal, Curiel, Lars Sjöström, Lena Carlsson	1997	53
20	Two weeks of daily injections and continuous infusion of recombinant human growth hormone (GH) in GH-deficient adults: 1. effects on insulin-like growth factor-I (IGF-I), GH and IGF binding proteins, and glucose homeostasis Metabolism ·Per Johansson, Jan Oscarsson, Ragnar Bjarnason, Bengt‐Åke Bengtsson	1996	44

About Ragnar Bjarnason

Ragnar Bjarnason is a scholar working on Endocrinology, Diabetes and Metabolism, Endocrine and Autonomic Systems, Public Health, Environmental and Occupational Health, Physiology and Pediatrics, Perinatology and Child Health, having authored 74 papers that have together received 4.3k indexed citations. Recurring topics across this work include Growth Hormone and Insulin-like Growth Factors (21 papers), Obesity, Physical Activity, Diet (16 papers), Eating Disorders and Behaviors (10 papers), Birth, Development, and Health (8 papers), Respiratory viral infections research (7 papers), Diabetes Management and Research (6 papers), Regulation of Appetite and Obesity (6 papers) and Asthma and respiratory diseases (6 papers). The work is most often cited by research in Epidemiology (2.3k citations), Physiology (1.6k citations), Emergency Medical Services (423 citations), Pulmonary and Respiratory Medicine (1.7k citations) and Endocrinology, Diabetes and Metabolism (620 citations). Ragnar Bjarnason has collaborated with scholars based in Sweden, Iceland and United States. Frequent co-authors include Nele Sigurs, Bengt Kjellman, Per Gustafsson, Bengt Björkstén, Susanne M. Schmidt, Fredrik Lundberg, Paul D. Robinson, Fatma Aljassim, Kerstin Albertsson‐Wikland and Lena Carlsson. Their work appears in journals such as The Journal of Clinical Endocrinology & Metabolism, Acta Paediatrica, European Journal of Endocrinology, Clinical Endocrinology and Pediatric Diabetes.

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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