Søreide K, Thorsen K, Harrison EM, Bingener J, Møller MH, Ohene-Yeboah M et al.Perforated peptic ulcer. Lancet 2015; 386: 1288–1298.
Lau JY, Sung J, Hill C, Henderson C, Howden CW, Metz DC. Systematic review of the epidemiology of complicated peptic ulcer disease: incidence, recurrence, risk factors and mortality. Digestion 2011; 84: 102–113.
Lanas A, García-Rodríguez LA, Polo-Tomás M, Ponce M, Alonso-Abreu I, Perez-Aisa MAet al. Time trends and impact of upper and lower gastrointestinal bleeding and perforation in clinical practice. Am J Gastroenterol 2009; 104: 1633–1641.
Svanes C. Trends in perforated peptic ulcer: incidence, etiology, treatment, and prognosis.World J Surg 2000; 24: 277–283.
Møller MH, Larsson HJ, Rosenstock S, Jørgensen H, Johnsen SP, Madsen AH et al.Quality-of-care initiative in patients treated surgically for perforated peptic ulcer. Br J Surg2013; 100: 543–552.
Thorsen K, Søreide JA, Kvaløy JT, Glomsaker T, Søreide K. Epidemiology of perforated peptic ulcer: age- and gender-adjusted analysis of incidence and mortality. World J Gastroenterol 2013; 19: 347–354.
Di Saverio S, Bassi M, Smerieri N, Masetti M, Ferrara F, Fabbri C et al. Diagnosis and treatment of perforated or bleeding peptic ulcers: 2013 WSES position paper. World J Emerg Surg 2014; 9: 45.
Møller MH, Adamsen S, Thomsen RW, Møller AM. Preoperative prognostic factors for mortality in peptic ulcer perforation: a systematic review. Scand J Gastroenterol 2010; 45:785–805.
Thorsen K, Søreide JA, Søreide K. What is the best predictor of mortality in perforated peptic ulcer disease? A population-based, multivariable regression analysis including three clinical scoring systems. J Gastrointest Surg 2014; 18: 1261–1268.
Møller MH, Engebjerg MC, Adamsen S, Bendix J, Thomsen RW. The Peptic Ulcer Perforation (PULP) score: a predictor of mortality following peptic ulcer perforation. A cohort study. Acta Anaesthesiol Scand 2012; 56: 655–662.
Thorsen K, Søreide JA, Søreide K. Scoring systems for outcome prediction in patients with perforated peptic ulcer. Scand J Trauma Resusc Emerg Med 2013; 21: 25.
Wilhelmsen M, Møller MH, Rosenstock S. Surgical complications after open and laparoscopic surgery for perforated peptic ulcer in a nationwide cohort. Br J Surg 2015; 102:382–387.
Maghsoudi H, Ghaffari A. Generalized peritonitis requiring re-operation after leakage of omental patch repair of perforated peptic ulcer. Saudi J Gastroenterol 2011; 17: 124–128.
Evans JP, Smith R. Predicting poor outcome in perforated peptic ulcer disease. Aust N Z J Surg 1997; 67: 792–795.
Bafeta A, Dechartres A, Trinquart L, Yavchitz A, Boutron I, Ravaud P. Impact of single centre status on estimates of intervention effects in trials with continuous outcomes: meta-epidemiological study. BMJ 2012; 344: e813.
Kehlet H, Wilmore DW. Evidence-based surgical care and the evolution of fast-track surgery.Ann Surg 2008; 248: 189–198.
Møller MH, Adamsen S, Thomsen RW, Møller AM. Multicentre trial of a perioperative protocol to reduce mortality. Br J Surg 2011; 98: 802–810.
von Elm E, Altman DG, Egger M, Pocock SJ, Gøtzsche PC, Vandenbroucke JP; STROBE Initiative. Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) statement: guidelines for reporting observational studies. BMJ 2007; 335: 806–808.
Mainz J, Krog BR, Bjørnshave B, Bartels P. Nationwide continuous quality improvement using clinical indicators: the Danish National Indicator Project. Int J Qual Health Care 2004;16(Suppl 1): i45–i50.
Pedersen CB. The Danish Civil Registration System. Scand J Public Health 2011; 39:22–25.
Pedersen CB, Gøtzsche H, Møller JO, Mortensen PB. The Danish Civil Registration System. A cohort of eight million persons. Dan Med Bull 2006; 53: 441–449.