Publications by authors named "Svein O Frigstad"

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Incomplete endoscopic resection of colorectal polyps: a prospective quality assurance study.
Ina B Pedersen, Michael Bretthauer, Mette Kalager, Magnus Løberg, Geir Hoff, Senaria Matapour, Silje Hugin, Svein O Frigstad, Birgitte Seip, Britta A Kleist

Endoscopy· April 2021

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Colorectal ESD in a nordic community hospital: learning curves and clinical outcomes.
Jens Aksel Nilsen, Frederik Emil Juul, Anders Egeland, Petter Tandberg, Espen Norvard, Svein Oskar Frigstad

Scand J Gastroenterol· November 2025

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Environmental impact of computer-aided diagnosis in colonoscopy: a carbon footprint assessment of a prospective study cohort.
Olaolu Olabintan, Natalie Halvorsen, Robin Baddeley, Shin-Ei Kudo, Ishita Barua, Svein Oskar Frigstad

Endoscopy· November 2025

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Prevalence of Irritable Bowel Syndrome Based on Rome IV Criteria in Patients in Biochemical and Endoscopic Remission From Newly Diagnosed Inflammatory Bowel Disease: One- and Three-Year Results (the IBSEN III Cohort).
Bjorn Christian Olsen, Randi Opheim, Vendel A Kristensen, Marte Lie Høivik, Charlotte Lund, Svein Oskar Frigstad

Inflamm Bowel Dis· October 2025

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Low Surgery Rates in Early Crohn's Disease: Results from a Prospective Population-Based Inception Cohort-The Inflammatory Bowel Disease in South-Eastern Norway III Study.
Charlotte Lund, Vibeke Strande, Milada Hagen, May-Bente Bengtson, Raziye Boyar, Svein Oskar Frigstad

Inflamm Bowel Dis· August 2025

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Fecal Microbiome Reflects Disease State and Prognosis in Inflammatory Bowel Disease in an Adult Population-Based Inception Cohort.
Simen Hyll Hansen, Maria Gjerstad Maseng, Olle Grännö, Marie V Vestergaard, Corinna Bang, Svein O Frigstad

Inflamm Bowel Dis· August 2025

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Predicting severe inflammatory bowel disease: a risk matrix model based on the IBSEN III inception cohort.
Vibeke Strande, Milada Hagen, Charlotte Lund, Øyvind Asak, May-Bente Bengtson, Svein Oskar Frigstad

Scand J Gastroenterol· July 2025

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Leaving colorectal polyps in situ with endocytoscopy assisted by computer-aided diagnosis: a cost-effectiveness study.
Natalie Halvorsen, Ishita Barua, Shin-Ei Kudo, Shraddha Gulati, Masashi Misawa, Svein Oskar Frigstad

Endoscopy· June 2025

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Correction: Leaving colorectal polyps in situ with endocytoscopy assisted by computer-aided diagnosis: a cost-effectiveness study.
Natalie Halvorsen, Ishita Barua, Shin-Ei Kudo, Shraddha Gulati, Masashi Misawa, Svein Oskar Frigstad

Endoscopy· June 2025

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Habitual intake of macronutrients and fermentable oligo-, di-, monosaccharides and polyols is not associated with irritable bowel syndrome-like symptoms in inflammatory bowel disease.
Insaf Zerouga, Jørgen Valeur, Christine Sommer, Monica Hauger Carlsen, Milada Hagen, Svein Oskar Frigstad

Clin Nutr ESPEN· June 2025

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Iron deficiency should not be accepted in patients with inflammatory bowel disease - a Scandinavian expert opinion.
Trond Espen Detlie, Johan Burisch, Jørgen Jahnsen, Ole Bonderup, Per M Hellström, Svein Oskar Frigstad

Scand J Gastroenterol· May 2025

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Fatigue in Patients with Inflammatory Bowel Disease in Remission One Year After Diagnosis (the IBSEN III Study).
Kristina A Holten, Tomm Bernklev, Randi Opheim, Bjørn C Olsen, Trond Espen Detlie, Svein Oskar Frigstad

J Crohns Colitis· April 2025

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Adverse events after colonoscopy in a randomised colorectal cancer screening trial.
Øyvind Bakken Rognstad, Edoardo Botteri, Geir Hoff, Michael Bretthauer, Elisabeth Gulichsen, Svein Oskar Frigstad

BMJ Open Gastroenterol· October 2024

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Surgical treatment of benign colorectal polyps 2008-21.
Jens Aksel Nilsen, Linn Bernklev, Michael Bretthauer, Mette Kalager, Henriette C Jodal, Svein Oskar Frigstad

Tidsskr Nor Laegeforen· September 2024

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Clinical course of ulcerative colitis: Frequent use of biologics and low colectomy rate first year after diagnosis-results from the IBSEN III inception cohort.
Vibeke Strande, Charlotte Lund, Milada Hagen, May-Bente Bengtson, Raziye Boyar Cetinkaya, Svein Oskar Frigstad

Aliment Pharmacol Ther· August 2024

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Dietary intake and nutritional status in patients with newly diagnosed inflammatory bowel disease: insights from the IBSEN III study.
Insaf Zerouga, Jørgen Valeur, Christine Sommer, Milada Cvancarova Småstuen, Asle Wilhelm Medhus, Svein Oskar Frigstad

Scand J Gastroenterol· June 2024

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Fatigue in Patients with Newly Diagnosed Inflammatory Bowel Disease: Results from a Prospective Inception Cohort, the IBSEN III Study.
Kristina I Aass Holten, Tomm Bernklev, Randi Opheim, Ingunn Johansen, Bjørn C Olsen, Svein Oskar Frigstad

J Crohns Colitis· November 2023

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Symptoms and symptom clusters in patients newly diagnosed with inflammatory bowel disease: results from the IBSEN III Study.
Ingunn Johansen, Milada Cvancarova Småstuen, Stine Torp Løkkeberg, Vendel Ailin Kristensen, Marte Lie Høivik, Svein Oskar Frigstad

BMC Gastroenterol· July 2023

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[The FIB-4 test as a decision-making tool].
John Willy Haukeland, Mette Nåmdal Vesterhus, Kristin Kaasen Jørgensen, Svein Oskar Frigstad, Tom Hemming Karlsen

Tidsskr Nor Laegeforen· March 2023

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The multidimensional fatigue inventory (MFI-20): psychometrical testing in a Norwegian sample of inflammatory bowel disease (IBD) patients.
Lars-Petter Jelsness-Jørgensen, Bjørn Moum, Tore Grimstad, Jørgen Jahnsen, Øistein Hovde, Svein Oskar Frigstad

Scand J Gastroenterol· June 2022

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Real-Time Artificial Intelligence-Based Optical Diagnosis of Neoplastic Polyps during Colonoscopy.
Ishita Barua, Paulina Wieszczy, Shin-Ei Kudo, Masashi Misawa, Øyvind Holme, Svein Oskar Frigstad

NEJM Evid· June 2022

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[We need a new strategy for liver disease].
Mette Vesterhus, Kristin Kaasen Jørgensen, Svein Oskar Frigstad, John Willy Haukeland, Tom Hemming Karlsen

Tidsskr Nor Laegeforen· February 2022

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Inflammatory bowel disease in South-Eastern Norway III (IBSEN III): a new population-based inception cohort study from South-Eastern Norway.
Vendel A Kristensen, Randi Opheim, Gøri Perminow, Gert Huppertz-Hauss, Trond Espen Detlie, Svein Oskar Frigstad

Scand J Gastroenterol· August 2021

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[Diagnosis and treatment of autoimmune hepatitis].
Mette Vesterhus, Kristine Wiencke, John Willy Haukeland, Svein Oskar Frigstad, Lars Normann Karlsen

Tidsskr Nor Laegeforen· June 2021

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Colorectal Cancer Screening With Repeated Fecal Immunochemical Test Versus Sigmoidoscopy: Baseline Results From a Randomized Trial.
Kristin R Randel, Anna L Schult, Edoardo Botteri, Geir Hoff, Michael Bretthauer, Svein Oskar Frigstad

Gastroenterology· March 2021

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Efficacy and Safety of CT-P13 in Inflammatory Bowel Disease after Switching from Originator Infliximab: Exploratory Analyses from the NOR-SWITCH Main and Extension Trials.
Kristin K Jørgensen, Guro L Goll, Joe Sexton, Nils Bolstad, Inge C Olsen, Svein O Frigstad

BioDrugs· October 2020

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