Thorsen, K., Søreide, J. A., Kvaløy, J. T., Glomsaker, T., & Søreide, K. (2013). Epidemiology of perforated peptic ulcer: Age- and gender-adjusted analysis of incidence and mortality. Baishideng Publishing Group Co., Limited.

Thorsen, Kenneth, Jon Arne Søreide, Jan Terje Kvaløy, Tom Glomsaker, و Kjetil Søreide. Epidemiology of Perforated Peptic Ulcer: Age- and Gender-adjusted Analysis of Incidence and Mortality. Baishideng Publishing Group Co., Limited, 2013.

Thorsen, Kenneth, et al. Epidemiology of Perforated Peptic Ulcer: Age- and Gender-adjusted Analysis of Incidence and Mortality. Baishideng Publishing Group Co., Limited, 2013.