Johann Hammer

3.0k total citations
80 papers, 2.2k citations indexed

About

Johann Hammer is a scholar working on Gastroenterology, Surgery and Physiology. According to data from OpenAlex, Johann Hammer has authored 80 papers receiving a total of 2.2k indexed citations (citations by other indexed papers that have themselves been cited), including 51 papers in Gastroenterology, 28 papers in Surgery and 25 papers in Physiology. Recurrent topics in Johann Hammer's work include Gastrointestinal motility and disorders (44 papers), Helicobacter pylori-related gastroenterology studies (25 papers) and Diet and metabolism studies (17 papers). Johann Hammer is often cited by papers focused on Gastrointestinal motility and disorders (44 papers), Helicobacter pylori-related gastroenterology studies (25 papers) and Diet and metabolism studies (17 papers). Johann Hammer collaborates with scholars based in Austria, Australia and United States. Johann Hammer's co-authors include Michael Jones, Peter Bytzer, Nicholas J. Talley, Michael Horowitz, Heinz F. Hammer, Nicholas J. Talley, Harald Vogelsang, Lisa J. Young, Lisa Young and Nicholas J. Talley and has published in prestigious journals such as The Lancet, Gastroenterology and Gut.

In The Last Decade

Johann Hammer

78 papers receiving 2.1k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Johann Hammer Austria 28 1.3k 919 504 252 220 80 2.2k
Esteban Saperas Spain 24 1.5k 1.2× 1.2k 1.3× 394 0.8× 259 1.0× 59 0.3× 63 2.6k
İrfan Soykan Türkiye 26 1.1k 0.9× 892 1.0× 392 0.8× 503 2.0× 112 0.5× 95 2.5k
Antonietta Russo Australia 31 792 0.6× 855 0.9× 906 1.8× 76 0.3× 704 3.2× 53 2.5k
L. Benini Italy 27 639 0.5× 1.3k 1.5× 504 1.0× 482 1.9× 176 0.8× 94 2.5k
Gregory S. Sayuk United States 30 1.5k 1.2× 1.2k 1.3× 282 0.6× 297 1.2× 155 0.7× 128 2.4k
Andrea Shin United States 25 1.2k 1.0× 850 0.9× 491 1.0× 307 1.2× 89 0.4× 76 2.1k
Ron Schey United States 24 1.1k 0.9× 837 0.9× 377 0.7× 130 0.5× 57 0.3× 99 1.8k
Yoshikazu Kinoshita Japan 34 2.4k 1.8× 2.3k 2.5× 310 0.6× 283 1.1× 42 0.2× 154 3.3k
Full-Young Chang Taiwan 30 708 0.5× 1.1k 1.2× 368 0.7× 823 3.3× 71 0.3× 83 2.8k
Seth Sweetser United States 23 612 0.5× 848 0.9× 225 0.4× 196 0.8× 54 0.2× 98 1.8k

Countries citing papers authored by Johann Hammer

Since Specialization
Citations

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

Fields of papers citing papers by Johann Hammer

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Johann Hammer

This figure shows the co-authorship network connecting the top 25 collaborators of Johann Hammer. A scholar is included among the top collaborators of Johann Hammer 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 Johann Hammer. Johann Hammer 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.
Morrison, Mark, Karin Hammer, Johann Hammer, et al.. (2024). Prevalence of small intestinal bacterial overgrowth in intestinal failure syndrome: A systematic review and meta‐analysis. Journal of Gastroenterology and Hepatology. 39(11). 2308–2318. 2 indexed citations
2.
Hammer, Johann. (2018). Identification of Individuals with Functional Dyspepsia With a Simple, Minimally Invasive Test: A Single Center Cohort Study of the Oral Capsaicin Test. The American Journal of Gastroenterology. 113(4). 584–592. 17 indexed citations
3.
Koloski, Natasha A., Michael Jones, Johann Hammer, et al.. (2017). The Validity of a New Structured Assessment of Gastrointestinal Symptoms Scale (SAGIS) for Evaluating Symptoms in the Clinical Setting. Digestive Diseases and Sciences. 62(8). 1913–1922. 44 indexed citations
4.
Hammer, Heinz F. & Johann Hammer. (2012). Diarrhea Caused By Carbohydrate Malabsorption. Gastroenterology Clinics of North America. 41(3). 611–627. 56 indexed citations
5.
Cao, Yang, et al.. (2011). Characterization of a reproducible gastric pain model using oral capsaicin titration in healthy volunteers. Neurogastroenterology & Motility. 23(7). e261–e270. 12 indexed citations
6.
Hoepler, Wolfgang, Karin Hammer, & Johann Hammer. (2010). Gastric phenotype in children withHelicobacter pyloriinfection undergoing upper endoscopy. Scandinavian Journal of Gastroenterology. 46(3). 293–298. 9 indexed citations
7.
Georg, Petra, Christian Kirisits, Gregor Goldner, et al.. (2009). Correlation of dose–volume parameters, endoscopic and clinical rectal side effects in cervix cancer patients treated with definitive radiotherapy including MRI-based brachytherapy. Radiotherapy and Oncology. 91(2). 173–180. 94 indexed citations
8.
Hammer, Johann & Nicholas J. Talley. (2008). Value of Different Diagnostic Criteria for the Irritable Bowel Syndrome Among Men and Women. Journal of Clinical Gastroenterology. 42(2). 160–166. 18 indexed citations
9.
Hammer, Johann, et al.. (2007). Intestinal chemo‐ and mechano‐sensitivity: selective modification of small intestinal sensitivity by lipids. Alimentary Pharmacology & Therapeutics. 26(1). 117–124. 13 indexed citations
10.
Hammer, Johann, et al.. (2007). Hypersensitivity for capsaicin in patients with functional dyspepsia. Neurogastroenterology & Motility. 20(2). 125–133. 81 indexed citations
11.
Hammer, Johann. (2006). Effect of repeated capsaicin ingestion on intestinal chemosensation and mechanosensation. Alimentary Pharmacology & Therapeutics. 24(4). 679–686. 36 indexed citations
12.
Quan, Carolyn, N. J. Talley, Shane Cross, et al.. (2003). Development and validation of the Diabetes Bowel Symptom Questionnaire. Alimentary Pharmacology & Therapeutics. 17(9). 1179–1187. 36 indexed citations
13.
Eslick, Guy D., Stuart Howell, Johann Hammer, & Nicholas J. Talley. (2003). Empirically derived symptom sub‐groups correspond poorly with diagnostic criteria for functional dyspepsia and irritable bowel syndrome. A factor and cluster analysis of a patient sample. Alimentary Pharmacology & Therapeutics. 19(1). 133–140. 26 indexed citations
14.
Talley, Nicholas J., et al.. (2001). Psychological Distress Is Linked To Gastrointestinal Symptoms in Diabetes Mellitus. The American Journal of Gastroenterology. 96(4). 1033–1038. 69 indexed citations
15.
Talley, Nicholas J., Lisa Young, Peter Bytzer, et al.. (2001). Impact of chronic gastrointestinal symptoms in diabetes mellitus on health-related quality of life. The American Journal of Gastroenterology. 96(1). 71–76. 162 indexed citations
16.
Hammer, Johann & Nicholas J. Talley. (2000). Nonulcer dyspepsia. Current Opinion in Gastroenterology. 16(6). 503–507. 2 indexed citations
17.
Hammer, Johann, Heinz F. Hammer, Andreas Eherer, et al.. (1998). Intraluminal capsaicin does not affect fluid and electrolyte absorption in the human jejunum but does cause pain. Gut. 43(2). 252–255. 37 indexed citations
18.
Hammer, Johann, Kimberly Hammer, & Kurt Kletter. (1998). Lipids infused into the jejunum accelerate small intestinal transit but delay ileocolonic transit of solids and liquids. Gut. 43(1). 111–116. 23 indexed citations
19.
Hammer, Johann, et al.. (1993). Does the ileocolonic junction differentiate between solids and liquids?. Gut. 34(2). 222–226. 16 indexed citations
20.
Hammer, Johann, S. F. Phillips, Nicholas J. Talley, & Michael Camilleri. (1993). Effect of a 5HT3‐antagonist (ondansetron) on rectal sensitivity and compliance in health and the irritable bowel syndrome. Alimentary Pharmacology & Therapeutics. 7(5). 543–551. 78 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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