M. Claßen

6.1k total citations · 1 hit paper
207 papers, 4.3k citations indexed

About

M. Claßen is a scholar working on Surgery, Pulmonary and Respiratory Medicine and Oncology. According to data from OpenAlex, M. Claßen has authored 207 papers receiving a total of 4.3k indexed citations (citations by other indexed papers that have themselves been cited), including 112 papers in Surgery, 70 papers in Pulmonary and Respiratory Medicine and 41 papers in Oncology. Recurrent topics in M. Claßen's work include Gallbladder and Bile Duct Disorders (43 papers), Esophageal and GI Pathology (35 papers) and Pediatric Hepatobiliary Diseases and Treatments (29 papers). M. Claßen is often cited by papers focused on Gallbladder and Bile Duct Disorders (43 papers), Esophageal and GI Pathology (35 papers) and Pediatric Hepatobiliary Diseases and Treatments (29 papers). M. Claßen collaborates with scholars based in Germany, United States and Russia. M. Claßen's co-authors include L Demling, Horst Neuhaus, V. Schusdziarra, F. Hagenmüller, Wolfgang Schepp, Henryk Dancygier, Thomas Rösch, L. Demling, Michel Cremer and William R. Lees and has published in prestigious journals such as Nature, New England Journal of Medicine and Gastroenterology.

In The Last Decade

M. Claßen

197 papers receiving 4.0k 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.

Endoskopische Sphinkterotomie der Papilla Vateri und Steinextraktion aus dem Ductus choledochus

1974 422 citations M. Claßen et al. DMW - Deutsche Medizinische Wochenschrift profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
M. Claßen Germany	33	3.0k	1.9k	1.1k	724	394	207	4.3k
Meinhard Classen Germany	30	3.0k 1.0×	1.8k 1.0×	1.6k 1.5×	575 0.8×	421 1.1×	99	4.7k
Mark Berner Hansen Denmark	26	905 0.3×	706 0.4×	689 0.6×	530 0.7×	842 2.1×	107	3.0k
Jörg C. Kalff Germany	34	2.8k 0.9×	706 0.4×	845 0.8×	585 0.8×	776 2.0×	230	5.2k
R. Orlando Italy	30	1.3k 0.4×	515 0.3×	291 0.3×	646 0.9×	421 1.1×	136	3.3k
Eran Goldin Israel	32	1.8k 0.6×	643 0.3×	685 0.6×	557 0.8×	646 1.6×	166	4.5k
Lian Zhang China	40	2.1k 0.7×	1.2k 0.6×	440 0.4×	282 0.4×	913 2.3×	161	5.2k
James E. McGuigan United States	37	2.2k 0.7×	492 0.3×	496 0.5×	1.2k 1.7×	1.0k 2.6×	164	4.6k
Preben Olund Kirkegaard Denmark	34	1.8k 0.6×	359 0.2×	643 0.6×	235 0.3×	682 1.7×	151	3.7k
Sven Seiwerth Croatia	35	1.5k 0.5×	662 0.3×	290 0.3×	489 0.7×	735 1.9×	237	3.4k
E. Wenzl Austria	28	1.3k 0.4×	637 0.3×	348 0.3×	385 0.5×	462 1.2×	101	2.5k

Countries citing papers authored by M. Claßen

Since Specialization

Citations

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

Fields of papers citing papers by M. Claßen

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of M. Claßen

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

Strohm, W. D. & M. Claßen. (2008). Endosonographie mit einem Gastrofiberskop. Ultraschall in der Medizin - European Journal of Ultrasound. 5(3). 84–93. 1 indexed citations

Storr, Martin, Peter Born, E. Frimberger, et al.. (2002). Treatment of achalasia: the short-term response to botulinum toxin injection seems to be independent of any kind of pretreatment. BMC Gastroenterology. 2(1). 19–19. 31 indexed citations

Frimberger, E., Stefan Wagenpfeil, Peter Born, et al.. (2001). A New System for Rapid Large-Caliber Percutaneous Transhepatic Drainage in Patients with Obstructive Jaundice: A Prospective Randomized Trial. Endoscopy. 33(3). 201–209. 7 indexed citations

Seige, Markus, et al.. (1999). Long term treatment of patients with acute exacerbation of chronic liver failure by albumin dialysis. Transplantation Proceedings. 31(1-2). 1371–1375. 46 indexed citations

Claßen, M., et al.. (1995). Intent to treat metronidazole resistant H. pylori infection to 100% of cure. Therapy with quadruple therapy and its modification. Gastroenterology. 108(4). A216–A216. 4 indexed citations

Seifarth, C., et al.. (1995). Selective increase of CD4+ and CD25+ T cells but not of gamma delta T cells in H. pylori associated gastritis.. PubMed. 371B. 931–4. 12 indexed citations

Neuhaus, H., Werner Hoffmann, C. Zillinger, & M. Claßen. (1993). Laser lithotripsy of difficult bile duct stones under direct visual control.. Gut. 34(3). 415–421. 64 indexed citations

Armstrong, David, R. Arnold, M. Claßen, et al.. (1993). Prospective multicentre study of risk factors associated with delayed healing of recurrent duodenal ulcers (RUDER). RUDER Study Group.. Gut. 34(10). 1319–1326. 13 indexed citations

Martin, Kea, et al.. (1993). Immunology and pathophysiology. Gut. 34(3 Suppl). S37–S38. 12 indexed citations

10.

Neuhaus, Horst, Werner Hoffmann, & M. Claßen. (1992). Laser Lithotripsy of Pancreatic and Biliary Stones via 3.4 mm and 3.7 mm Miniscopes: First Clinical Results. Endoscopy. 24(3). 208–214. 29 indexed citations

11.

Frimberger, E., C. Zillinger, & M. Claßen. (1992). Evaluation of Laparoscopic Cholecystotomy in the Treatment of Gallbladder Stones. Endoscopy. 24(8). 717–720. 2 indexed citations

12.

Allescher, H.D., et al.. (1991). Modulatory Effect of Insulin on Rat Small Intestinal Motility and Peptide Release in vitro. Digestion. 48(4). 192–201. 4 indexed citations

13.

Schepp, Wolfgang, et al.. (1991). GLP-1-(7-36) amide, -(1-37), and -(1-36) amide: potent cAMP-dependent stimuli of rat parietal cell function. American Journal of Physiology-Gastrointestinal and Liver Physiology. 260(6). G940–G950. 27 indexed citations

14.

Wagner, F.M., et al.. (1990). Evaluation of Inter- and Intramolecular Primary Structure Homologies of Interferons by a Monte Carlo Method. Journal of Interferon Research. 10(1). 31–38. 3 indexed citations

15.

Schmid, Roland M., V. Schusdziarra, Ewert Schulte‐Frohlinde, V. Maier, & M. Claßen. (1989). Effect of CCK on Insulin, Glucagon, and Pancreatic Polypeptide Levels in Humans. Pancreas. 4(6). 653–661. 12 indexed citations

16.

Schmid, Roland M., H. D. Allescher, Wolfgang Schepp, et al.. (1988). Effect of somatostatin on skin lesions and concentrations of plasma amino acids in a patient with glucagonoma-syndrome.. PubMed. 35(1). 34–7. 6 indexed citations

17.

Claßen, M., F. Hagenmüller, K. Knyrim, & E. Frimberger. (1988). Giant Bile Duct Stones - Non-Surgical Treatment. Endoscopy. 20(1). 21–26. 49 indexed citations

18.

Axon, A T, M. Claßen, Peter B. Cotton, et al.. (1984). Pancreatography in chronic pancreatitis: international definitions.. Gut. 25(10). 1107–1112. 337 indexed citations

19.

Claßen, M. & L Sáfrány. (1975). Endoscopic papillotomy and removal of gall stones.. BMJ. 4(5993). 371–374. 69 indexed citations

20.

Deyhle, P, et al.. (1970). Neue Verfahren für die Intestinoskopie. DMW - Deutsche Medizinische Wochenschrift. 95(43). 2194–2195. 5 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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