Hans‐Olaf Johannessen

971 total citations
34 papers, 646 citations indexed

About

Hans‐Olaf Johannessen is a scholar working on Surgery, Pulmonary and Respiratory Medicine and Radiology, Nuclear Medicine and Imaging. According to data from OpenAlex, Hans‐Olaf Johannessen has authored 34 papers receiving a total of 646 indexed citations (citations by other indexed papers that have themselves been cited), including 23 papers in Surgery, 16 papers in Pulmonary and Respiratory Medicine and 8 papers in Radiology, Nuclear Medicine and Imaging. Recurrent topics in Hans‐Olaf Johannessen's work include Esophageal and GI Pathology (14 papers), Esophageal Cancer Research and Treatment (9 papers) and Gastric Cancer Management and Outcomes (7 papers). Hans‐Olaf Johannessen is often cited by papers focused on Esophageal and GI Pathology (14 papers), Esophageal Cancer Research and Treatment (9 papers) and Gastric Cancer Management and Outcomes (7 papers). Hans‐Olaf Johannessen collaborates with scholars based in Norway, Sweden and Germany. Hans‐Olaf Johannessen's co-authors include Arild Nesbakken, Torgeir Bruun Wyller, Arne Bakka, Siri Rostoft, Eva Skovlund, Marit Slaaen, Egil Johnson, Riccardo A. Audisio, Erik Carlsen and Erlend Christoffer Sommer Landsend and has published in prestigious journals such as Annals of Surgery, International Journal of Radiation Oncology*Biology*Physics and Critical Reviews in Oncology/Hematology.

In The Last Decade

Hans‐Olaf Johannessen

33 papers receiving 634 citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Hans‐Olaf Johannessen Norway 10 302 294 186 154 147 34 646
F. De Havilland Hall United States 9 404 1.3× 165 0.6× 182 1.0× 80 0.5× 99 0.7× 16 656
John O. Larkin Ireland 12 574 1.9× 73 0.2× 166 0.9× 92 0.6× 289 2.0× 51 800
Anke B. Smits Netherlands 15 365 1.2× 54 0.2× 110 0.6× 51 0.3× 470 3.2× 55 713
Itsuto Hamano Japan 15 274 0.9× 100 0.3× 37 0.2× 63 0.4× 101 0.7× 48 625
S Simpkins United Kingdom 3 114 0.4× 509 1.7× 98 0.5× 369 2.4× 187 1.3× 4 694
Norbert M. Verweij Netherlands 10 197 0.7× 147 0.5× 58 0.3× 117 0.8× 227 1.5× 12 450
H.S.J. Ramesh United Kingdom 7 162 0.5× 246 0.8× 138 0.7× 134 0.9× 203 1.4× 14 535
Moshim Kukar United States 17 789 2.6× 91 0.3× 230 1.2× 91 0.6× 283 1.9× 59 1.1k
Steven Nurkin United States 18 854 2.8× 94 0.3× 262 1.4× 103 0.7× 571 3.9× 52 1.3k
D. Mobarak United Kingdom 5 131 0.4× 229 0.8× 110 0.6× 123 0.8× 168 1.1× 8 432

Countries citing papers authored by Hans‐Olaf Johannessen

Since Specialization
Citations

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

Fields of papers citing papers by Hans‐Olaf Johannessen

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Hans‐Olaf Johannessen. 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 Hans‐Olaf Johannessen. The network helps show where Hans‐Olaf Johannessen may publish in the future.

Co-authorship network of co-authors of Hans‐Olaf Johannessen

This figure shows the co-authorship network connecting the top 25 collaborators of Hans‐Olaf Johannessen. A scholar is included among the top collaborators of Hans‐Olaf Johannessen 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 Hans‐Olaf Johannessen. Hans‐Olaf Johannessen is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Klevebro, Fredrik, Éva Szabó, Ingvar Halldestam, et al.. (2025). Nutritional outcomes and impact of malnutrition in a randomised comparison between standard and prolonged time to surgery after neoadjuvant chemoradiotherapy for oesophageal cancer. European Journal of Surgical Oncology. 51(9). 110228–110228.
2.
Johannessen, Hans‐Olaf, et al.. (2023). Outcome after stent and endoscopic vacuum therapy-based treatment for postemetic esophageal rupture. Scandinavian Journal of Gastroenterology. 59(1). 1–6. 3 indexed citations
3.
Carlsen, Erik, et al.. (2021). Short-, long-, and very long-term results of secondary anterior sphincteroplasty in 20 patients with obstetric injury. International Journal of Colorectal Disease. 36(12). 2775–2778. 3 indexed citations
4.
Johannessen, Hans‐Olaf, et al.. (2020). <p>Laser Doppler Flowmetry and Visible Light Spectroscopy of the Gastric Tube During Minimally Invasive Esophagectomy</p>. Vascular Health and Risk Management. Volume 16. 497–505. 7 indexed citations
5.
Amdal, Cecilie Delphin, et al.. (2020). Long-term outcome in patients operated with hybrid esophagectomy for esophageal cancer – a cohort study. Acta Oncologica. 59(7). 859–865. 5 indexed citations
6.
Johnson, Egil, et al.. (2018). Outcome after stenting and débridement for spontaneous esophageal rupture. Scandinavian Journal of Gastroenterology. 53(4). 398–402. 13 indexed citations
7.
Mala, Tom, et al.. (2018). Laparoskopisk reseksjon av ventrikkelcancer ved Oslo universitetssykehus, Ullevål 2015–18. Tidsskrift for Den norske legeforening. 138(18). 4 indexed citations
8.
Løberg, Else Marit, et al.. (2016). Reseksjon for oesophaguscancer – komplikasjoner og overlevelse. Tidsskrift for Den norske legeforening. 136(9). 809–813. 3 indexed citations
9.
Johnson, Egil, et al.. (2014). Kirurgisk behandling av epifrenisk oesophagusdivertikkel. Tidsskrift for Den norske legeforening. 134(10). 1047–1050. 7 indexed citations
10.
Johannessen, Hans‐Olaf, et al.. (2011). Sigmoidostomy-Related Parastomal Hernia. Scandinavian Journal of Surgery. 100(3). 186–189. 3 indexed citations
11.
Rostoft, Siri, Arild Nesbakken, Marit Slaaen, et al.. (2009). Comprehensive geriatric assessment can predict complications in elderly patients after elective surgery for colorectal cancer: A prospective observational cohort study. Critical Reviews in Oncology/Hematology. 76(3). 208–217. 316 indexed citations
12.
Langebrekke, Anton, Hans‐Olaf Johannessen, & Erik Qvigstad. (2008). [Surgical treatment of endometriosis].. PubMed. 128(13). 1515–8. 5 indexed citations
13.
Langebrekke, Anton, et al.. (2006). Endoscopic treatment of deep infiltrating endometriosis (DIE) involving the bladder and rectosigmoid colon. Acta Obstetricia Et Gynecologica Scandinavica. 85(6). 712–715. 18 indexed citations
14.
Johnson, Egil, et al.. (2006). Survival and complications after insertion of self-expandable metal stents for malignant oesophageal stenosis. Scandinavian Journal of Gastroenterology. 41(3). 252–256. 31 indexed citations
15.
Johnson, Egil, et al.. (2005). Kirurgi og stenting for cancer oesophagi. Tidsskrift for Den Norske Laegeforening. 1 indexed citations
16.
Johannessen, Hans‐Olaf, Egil Johnson, Thomas Mandel Clausen, & Odd Mjåland. (2004). [Pain and rehabilitation after inguinal hernia repair in adult male patients].. PubMed. 124(15). 1916–8. 1 indexed citations
17.
Johannessen, Hans‐Olaf, Einar Dale, Taran Paulsen Hellebust, et al.. (2002). Modeling volume effects of experimental brachytherapy in the rat rectum: uncovering the limitations of a radiobiologic concept. International Journal of Radiation Oncology*Biology*Physics. 53(4). 1014–1022. 4 indexed citations
18.
Johannessen, Hans‐Olaf, Dag Rune Olsen, Jahn M. Nesland, & K. E. Giercksky. (2000). High dose rate endocavitary irradiation of the rat rectum with an unshielded applicator: Early and late reactions after single dose and hypofractionation. 16(4). 235–248. 1 indexed citations
19.
Johannessen, Hans‐Olaf, Dag Rune Olsen, J. M. Nesland, & Karl Erik Giercksky. (1999). Influence of brachytherapy dosage and shielding on body weight and the development of radiation proctitis in the rat. 15(1). 51–64. 1 indexed citations
20.
Johannessen, Hans‐Olaf, Dag Rune Olsen, & Karl Erik Giercksky. (1996). Development of an experimental model for high dose rate endocavitary irradiation of the rat rectum. British Journal of Radiology. 69(826). 946–952. 2 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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