Gjermund Johnsen

2.2k total citations · 1 hit paper
49 papers, 1.5k citations indexed

About

Gjermund Johnsen is a scholar working on Surgery, Pulmonary and Respiratory Medicine and Physiology. According to data from OpenAlex, Gjermund Johnsen has authored 49 papers receiving a total of 1.5k indexed citations (citations by other indexed papers that have themselves been cited), including 44 papers in Surgery, 15 papers in Pulmonary and Respiratory Medicine and 10 papers in Physiology. Recurrent topics in Gjermund Johnsen's work include Bariatric Surgery and Outcomes (13 papers), Esophageal and GI Pathology (13 papers) and Esophageal Cancer Research and Treatment (10 papers). Gjermund Johnsen is often cited by papers focused on Bariatric Surgery and Outcomes (13 papers), Esophageal and GI Pathology (13 papers) and Esophageal Cancer Research and Treatment (10 papers). Gjermund Johnsen collaborates with scholars based in Norway, Sweden and United States. Gjermund Johnsen's co-authors include Ronald Mårvik, Magnus Nilsson, Lars Lundell, Helge L. Waldum, Fredrik Klevebro, Signe Friesland, Ingunn Hatlevoll, Nils Glenjen, Gabriella Alexandersson von Döbeln and Jon A. Tsai and has published in prestigious journals such as Gastroenterology, PLoS ONE and Cancer.

In The Last Decade

Gjermund Johnsen

43 papers receiving 1.5k 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.

A randomized clinical trial of neoadjuvant chemotherapy versus neoadjuvant chemoradiotherapy for cancer of the oesophagus or gastro-oesophageal junction

2016 273 citations Fredrik Klevebro, Gabriella Alexandersson von Döbeln et al. profile →

Peers

Gjermund Johnsen

SURGE

PRM

GASTR

ONCOL

PHYSI

Nicole Lopez United States

Matthew Ng United States

Nicola Tartaglia Italy

Juan Pablo Pantoja Mexico

Eric A. Gaumnitz United States

Stefano Bondi Italy

Robin Bülow Germany

Jong Hwa Lee South Korea

T. Wheeler United Kingdom

Vyas Prasad United Kingdom

Nicole Lopez United States

Gjermund Johnsen

358 ×0.3

SURGE

202 ×0.3

PRM

114 ×0.5

GASTR

284 ×1.5

ONCOL

81 ×0.5

PHYSI

Citations per year, relative to Gjermund Johnsen Gjermund Johnsen (= 1×) peers Nicole Lopez

Countries citing papers authored by Gjermund Johnsen

Since Specialization

Citations

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

Fields of papers citing papers by Gjermund Johnsen

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Gjermund Johnsen

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

Nymo, Siren, et al.. (2025). Lipid Changes 10–15 Years After Roux-en-Y Gastric Bypass: A Prospective Observational Study. Obesity Surgery. 35(2). 441–449. 1 indexed citations

Hedberg, Jakob, Magnus Sundbom, David Edholm, et al.. (2024). Randomized controlled trial of nasogastric tube use after esophagectomy: study protocol for the kinetic trial. Diseases of the Esophagus. 37(6).

Nymo, Siren, et al.. (2024). Postbariatric hypoglycemia, abdominal pain and gastrointestinal symptoms after Roux-en-Y gastric bypass explored by continuous glucose monitoring.. Obesity Research & Clinical Practice. 18(1). 9–14. 2 indexed citations

Nymo, Siren, Jens F. Rehfeld, Jens J. Holst, et al.. (2023). Suboptimal Weight Loss 13 Years After Roux-en-Y Gastric Bypass Is Associated with Blunted Appetite Response. Obesity Surgery. 34(2). 592–601. 1 indexed citations

Nymo, Siren, et al.. (2023). Vitamin and Mineral Deficiency 12 Years After Roux-en-Y Gastric Bypass a Cross-Sectional Multicenter Study. Obesity Surgery. 33(10). 3178–3185. 7 indexed citations

Nymo, Siren, et al.. (2022). The Long-Term Impact of Postoperative Educational Programs on Weight Loss After Roux-en-Y Gastric Bypass. Obesity Surgery. 32(9). 3005–3012. 7 indexed citations

Nymo, Siren, et al.. (2022). Diet and physical activity are associated with suboptimal weight loss and weight regain 10–15 years after Roux-en-Y gastric bypass: A cross-sectional study. Obesity Research & Clinical Practice. 16(2). 163–169. 15 indexed citations

Strømmen, Magnus, Christian A. Klöckner, Dag Arne Lihaug Hoff, et al.. (2021). Characteristics of Patients Reporting Presumed Problematic Drinking Behavior After Gastric Bypass: Exploring Long-Term Data From the BAROBS Study. Frontiers in Endocrinology. 12. 679006–679006. 4 indexed citations

Johnsen, Gjermund, et al.. (2019). Impact of increased resection rates and a liver parenchyma sparing strategy on long-term survival after surgery for colorectal liver metastases. A population-based study. Scandinavian Journal of Gastroenterology. 54(7). 890–898. 6 indexed citations

10.

Döbeln, Gabriella Alexandersson von, Fredrik Klevebro, Niels Hilmer Nielsen, et al.. (2018). Neoadjuvant chemotherapy versus neoadjuvant chemoradiotherapy for cancer of the esophagus or gastroesophageal junction: long-term results of a randomized clinical trial. Diseases of the Esophagus. 32(2). 115 indexed citations

11.

Döbeln, Gabriella Alexandersson von, Magnus Nilsson, Gunnar Adell, et al.. (2015). Pulmonary function and cardiac stress test after multimodality treatment of esophageal cancer. Practical Radiation Oncology. 6(3). e53–e59. 21 indexed citations

12.

Bringeland, Erling A., Hans H. Wasmuth, Gjermund Johnsen, et al.. (2013). Outcomes among patients treated for gastric adenocarcinoma during the last decade. Journal of Surgical Oncology. 107(7). 752–757. 10 indexed citations

13.

Våpenstad, Cecilie, Erlend Fagertun Hofstad, Lars Eirik Bø, et al.. (2012). Limitations of haptic feedback devices on construct validity of the LapSim® virtual reality simulator. Surgical Endoscopy. 27(4). 1386–1396. 28 indexed citations

14.

Langø, Thomas, Cecilie Våpenstad, Ole Vegard Solberg, et al.. (2011). Navigated laparoscopic ultrasound in abdominal soft tissue surgery: technological overview and perspectives. International Journal of Computer Assisted Radiology and Surgery. 7(4). 585–599. 33 indexed citations

15.

Kuhry, Esther, Gjermund Johnsen, Ronald Mårvik, & Robin Gaupset. (2009). Operasjoner uten arr. Tidsskrift for Den norske legeforening. 129(12). 1234–1235. 11 indexed citations

16.

Camilleri, Michael, J. Toouli, Miguel F. Herrera, et al.. (2008). Intra-abdominal vagal blocking (VBLOC therapy): Clinical results with a new implantable medical device. Surgery. 143(6). 723–731. 125 indexed citations

17.

Johnsen, Gjermund, et al.. (2005). Long-term outcome of surgically and medically treated patients with gastroesophageal reflux disease: A matched-pair follow-up study. Scandinavian Journal of Gastroenterology. 40(3). 264–274. 9 indexed citations

18.

Fossmark, Reidar, et al.. (2004). Rebound acid hypersecretion after long‐term inhibition of gastric acid secretion. Alimentary Pharmacology & Therapeutics. 21(2). 149–154. 87 indexed citations

19.

Bergamaschi, Roberto, et al.. (1998). Open versus laparoscopic gastrojejunostomy for palliation in advanced pancreatic cancer.. PubMed. 8(2). 92–6. 51 indexed citations

20.

Waldum, Helge L., Steinar Aase, И. М. Кветной, et al.. (1998). Neuroendocrine differentiation in human gastric carcinoma. Cancer. 83(3). 435–444. 7 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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