B. Olsen

Validity of Norwegian Rectal Cancer Registry data at a major university hospital 1997–2005

F. Pfeffer, O. Dahl, A. Karliczek, 2015, Acta oncologica.

Inflammatory bowel disease in South-Eastern Norway III (IBSEN III): a new population-based inception cohort study from South-Eastern Norway

S. Frigstad, M. Høivik, G. Huppertz-Hauss, 2021, Scandinavian journal of gastroenterology.

Rate of Anastomotic Leakage After Rectal Anastomosis Depends on the Definition: Pelvic Abscesses are Significant

F. Pfeffer, A. Karliczek, B. Olsen, 2018, Scandinavian journal of surgery : SJS : official organ for the Finnish Surgical Society and the Scandinavian Surgical Society.

Low rate of local recurrence detection by rectoscopy in follow‐up of rectal cancer

F. Pfeffer, A. Karliczek, B. Olsen, 2020, Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland.

Health-related quality of life in patients with newly diagnosed inflammatory bowel disease: an observational prospective cohort study (IBSEN III).

M. Høivik, G. Huppertz-Hauss, T. Bernklev, 2023, Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation.

Fatigue in patients with newly diagnosed inflammatory bowel disease: Results from a prospective inception cohort, the IBSEN III study.

S. Frigstad, M. Høivik, G. Huppertz-Hauss, 2023, Journal of Crohn's & colitis.

Symptoms and symptom clusters in patients newly diagnosed with inflammatory bowel disease: results from the IBSEN III Study

S. Frigstad, M. Høivik, G. Huppertz-Hauss, 2023, BMC Gastroenterology.